Cover - shares	3 Months Ended
	Sep. 30, 2021	Dec. 27, 2021
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Quarterly Report	true
Document Transition Report	false
Document Period End Date	Sep. 30, 2021
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2022
Current Fiscal Year End Date	--06-30
Entity File Number	000-12895
Entity Registrant Name	PETRO USA, INC.
Entity Central Index Key	0000745543
Entity Tax Identification Number	32-0252180
Entity Incorporation, State or Country Code	NV
Entity Address, Address Line One	7325 Oswego Road
Entity Address, City or Town	Liverpool
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	13090
City Area Code	315
Local Phone Number	451-7515
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	true
Entity Common Stock, Shares Outstanding		33,920