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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 Q5gNLD+Ce3iLHt58F0VJ52+kEDX+vn+hUfzYe887H4Q2RTqpfF5pC4LdKzHa1FVE
 Laptcu/Buv3Ebe4mLuHV4A==

<SEC-DOCUMENT>0000100726-10-000016.txt : 20100805
<SEC-HEADER>0000100726-10-000016.hdr.sgml : 20100805
<ACCEPTANCE-DATETIME>20100805155503
ACCESSION NUMBER:		0000100726-10-000016
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20100804
FILED AS OF DATE:		20100805
DATE AS OF CHANGE:		20100805

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			UNIFI INC
		CENTRAL INDEX KEY:			0000100726
		STANDARD INDUSTRIAL CLASSIFICATION:	TEXTILE MILL PRODUCTS [2200]
		IRS NUMBER:				112165495
		STATE OF INCORPORATION:			NY
		FISCAL YEAR END:			0624

	BUSINESS ADDRESS:	
		STREET 1:		7201 WEST FRIENDLY RD
		STREET 2:		P O BOX 19109
		CITY:			GREENSBORO
		STATE:			NC
		ZIP:			27419-9109
		BUSINESS PHONE:		9192944410

	MAIL ADDRESS:	
		STREET 1:		7201 W FRIENDLY RD
		STREET 2:		PO BOX 19109
		CITY:			GREENSBORO
		STATE:			NC
		ZIP:			24719-9109

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	AUTOMATED ENVIRONMENTAL SYSTEMS INC
		DATE OF NAME CHANGE:	19720906

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			LANGONE KENNETH G
		CENTRAL INDEX KEY:			0000905874
		STATE OF INCORPORATION:			NY
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-10542
		FILM NUMBER:		10994395

	MAIL ADDRESS:	
		STREET 1:		375 PARK AVENUE
		STREET 2:		STE 2205
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10152
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2010-08-04</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000100726</issuerCik>
        <issuerName>UNIFI INC</issuerName>
        <issuerTradingSymbol>UFI</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0000905874</rptOwnerCik>
            <rptOwnerName>LANGONE KENNETH G</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>375 PARK AVENUE</rptOwnerStreet1>
            <rptOwnerStreet2>STE 2205</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10152</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>COMMON STOCK</value>
            </securityTitle>
            <transactionDate>
                <value>2010-08-04</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>8000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>4</value>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1951800</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>COMMON STOCK</value>
            </securityTitle>
            <transactionDate>
                <value>2010-08-05</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>25000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>3.99</value>
                    <footnoteId id="F2"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1976800</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeHolding>
            <securityTitle>
                <value>COMMON STOCK</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>270000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>by Invemed Associates LLC</value>
                    <footnoteId id="F3"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">The Reporting Person executed a trade order through a broker-dealer which resulted in multiple same-day same-way open market purchases, with the prices ranging from $3.96 to $4.00/share.  The Reporting Person has reported these purchases on an aggregate basis using the weighted average price for the transactions and will provide detailed breakouts upon request.</footnote>
        <footnote id="F2">The Reporting Person executed a trade order through a broker-dealer which resulted in multiple same-day same-way open market purchases, with the prices ranging from $3.95 to $3.99/share.  The Reporting Person has reported these purchases on an aggregate basis using the weighted average price for the transactions and will provide detailed breakouts upon request.</footnote>
        <footnote id="F3">The Reporting Person is the principal equityholder and President and CEO of Invemed Associates, LLC.  Pursuant to Instruction (4)(b)(iv) of Form 4, the Reporting Person has elected to report as indirectly beneficially owned the entire number of securities beneficially owned by such entity.  The Reporting Person disclaims beneficial ownership of any securities, and any proceeds thereof, that exceed his pecuniary interest therein and/or that are not actually distributed to him.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/Kenneth G. Langone/Charles F. McCoy, POA</signatureName>
        <signatureDate>2010-08-05</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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