-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
 MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen
 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 Mc0QKqazFOSQaMBfUpme0fn+M02Bq7mHbOlCcT4ayJUCCqlwxALkLLP1JxJx/E+O
 xt5CcY9BwlGzGCt3lU5Wug==

<SEC-DOCUMENT>0001019687-09-001587.txt : 20090504
<SEC-HEADER>0001019687-09-001587.hdr.sgml : 20090504
<ACCEPTANCE-DATETIME>20090504183702
ACCESSION NUMBER:		0001019687-09-001587
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20090430
FILED AS OF DATE:		20090504
DATE AS OF CHANGE:		20090504

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			UNIVERSAL DETECTION TECHNOLOGY
		CENTRAL INDEX KEY:			0000763950
		STANDARD INDUSTRIAL CLASSIFICATION:	INDUSTRIAL INSTRUMENTS FOR MEASUREMENT, DISPLAY, AND CONTROL [3823]
		IRS NUMBER:				952746949
		STATE OF INCORPORATION:			CA
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		9595 WILSHIRE BOULEVARD, SUITE 700
		CITY:			BEVERLY HILLS
		STATE:			CA
		ZIP:			90212
		BUSINESS PHONE:		3102483655

	MAIL ADDRESS:	
		STREET 1:		9595 WILSHIRE BOULEVARD, SUITE 700
		CITY:			BEVERLY HILLS
		STATE:			CA
		ZIP:			90212

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	POLLUTION RESEARCH & CONTROL CORP /CA/
		DATE OF NAME CHANGE:	19920703

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	DASIBI ENVIRONMENTAL CORP
		DATE OF NAME CHANGE:	19900529

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			UNIVERSAL DETECTION TECHNOLOGY
		CENTRAL INDEX KEY:			0000763950
		STANDARD INDUSTRIAL CLASSIFICATION:	INDUSTRIAL INSTRUMENTS FOR MEASUREMENT, DISPLAY, AND CONTROL [3823]
		STATE OF INCORPORATION:			CA
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-09327
		FILM NUMBER:		09794935

	BUSINESS ADDRESS:	
		STREET 1:		9595 WILSHIRE BOULEVARD, SUITE 700
		CITY:			BEVERLY HILLS
		STATE:			CA
		ZIP:			90212
		BUSINESS PHONE:		3102483655

	MAIL ADDRESS:	
		STREET 1:		9595 WILSHIRE BOULEVARD, SUITE 700
		CITY:			BEVERLY HILLS
		STATE:			CA
		ZIP:			90212

	FORMER NAME:	
		FORMER CONFORMED NAME:	POLLUTION RESEARCH & CONTROL CORP /CA/
		DATE OF NAME CHANGE:	19920703

	FORMER NAME:	
		FORMER CONFORMED NAME:	DASIBI ENVIRONMENTAL CORP
		DATE OF NAME CHANGE:	19900529
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2009-04-30</periodOfReport>

    <issuer>
        <issuerCik>0000763950</issuerCik>
        <issuerName>UNIVERSAL DETECTION TECHNOLOGY</issuerName>
        <issuerTradingSymbol>UNDT</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0000763950</rptOwnerCik>
            <rptOwnerName>UNIVERSAL DETECTION TECHNOLOGY</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>9595 WILSHIRE BLVD</rptOwnerStreet1>
            <rptOwnerStreet2>SUITE 700</rptOwnerStreet2>
            <rptOwnerCity>BEVERLY HILLS,</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>90212</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>President, CEO, Acting CFO</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2009-04-30</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>117386666</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>352160.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>117926425</value>
                    <footnoteId id="F1"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Includes 539,750 shares of common stock of the company underlying fully vested options.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Jacques Tizabi</signatureName>
        <signatureDate>2009-05-04</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----