Lifting platform type beam bottom overhauling device

The utility model relates to a lifting platform type beam bottom overhauling device which comprises two beam transporting vehicles and an overhauling platform, the two beam transporting vehicles are located on the two sides of the top face of a bridge respectively, a cantilever support and a winch are fixedly arranged on each beam transporting vehicle, the front end of a cantilever of each cantilever support extends to the outer side of the bridge in the transverse bridge direction, and a steering wheel is arranged at the front end of each cantilever. The maintenance platform is located below the bridge, the two ends of the maintenance platform extend out of the two sides of the bridge respectively, and traction ropes of the winches on the two beam transporting vehicles bypass steering wheels at the front ends of the cantilever supports to be connected with the two ends of the maintenance platform respectively. The girder transporting vehicle walks on the bridge, and the maintenance platform is suspended unde