Disclosed is a trailer which is used for car examination and is characterized in that the trailer comprises a trailer main body, a plurality of trailer wheels and a driving mechanism, wherein the trailer wheels are arranged on two sides of the lower portion of the trailer main body, and the driving mechanism is arranged on the trailer main body to drive at least one wheel of the trailer wheels, thereby the trailer is driven to move. With the structure, the driving mechanism which is used to drive the trailer is installed on the trailer, thereby eliminating the relatively large impulse for steel rope, the impulse is caused by the driving of a winch in the prior art when starting and stopping, the operational reliability is increased, the system configuration is simplified, and the occupation area for installing the driving device is saved.