A man has quickly earned the title of WA's dumbest thief after stealing a CCTV camera from a business unaware that it was recording his every move.

Police now have an excellent picture of the thief.

The man threw a trailer tie-down cable over the camera that was mounted on an external wall of a business in Asperation Circuit, Bibra Lake.

The incident happened just after 4pm on July 14 this year.

The camera was ripped off the wall but it managed to record images of the man as it fell.

Police say the same man is believed to be responsible for four other similar offences at the same location over three months.

Anyone with information is asked to call Crime Stoppers on 1800 333 000.

Police posted the picture on their Facebook page, prompting comments of Smile!! You're on Candid Camera and West Australian dumbest thief.