Flaw detection car in body of high-speed rail bridge

A flaw detection car in the body of a high-speed rail bridge relates to a flaw detection device for a bridge body. A plurality of fixing frames (6) are arranged on the wall of a bridge hole (5) from the starting part of the bridge body (1) to a station yard or an ending part, and a slide bar (2) forms a slide rail for the flaw detection car; and the flaw detection car comprises a pulley (3), a connecting rod (12), a belt (11), a casing (4), a motor (15), a wireless signal emitter (14), a supersonic detector (20), a wide-angle probe (17), a storage battery (18), and a control button (19). In the invention, since the arrangement of the slide rail formed by the slide bar and the fixing frames on the wall of the bridge hole inside the body of the high-speed rail bridge, the flaw detection car is enabled to run and detect flaws in the bridge hole conveniently, and the disadvantage that observation can not be performed in many places by using a man and telescope flaw detection way in the prior art, can be effectively overcome. The wireless signal emitter arranged in the flaw detection car disclosed by the invention can achieve accurate positioning to the flaw detection car.