WorkSafe is investigating a second accident in three days involving cranes at the Australian Marine Complex, south of Fremantle.

A 25-tonne crane toppled over on the Quill Way property just after 7:00am while being turned around.

One of the workers was taken to Fremantle Hospital but his injuries are not life-threatening.

WorkSafe said a 250-tonne crane collapsed at the same complex on Tuesday.

The AMC precinct, about 23 kilometres south of Perth, contains more than 150 businesses geared towards manufacturing for the marine, defence and resource industries.

The AMC is overseen by the Western Australian Government through the Department of Commerce.

The Department of Commerce's John O'Hare said work has been suspended on the site until WorkSafe completes an investigation.

He said on Tuesday, a hire crane being serviced by a contractor tipped over. But it was not carrying a load, and no one was injured.

WorkSafe was also investigating that incident.