The utility model relates to a maintenance trolley for prefabricated box girders or T-beams. The maintenance trolley comprises a rack, wherein rolling wheels are arranged on four feet at the bottom of the rack; an unsealed rectangular frame is arranged above the rack, three PVC water pipes are fixed above the rectangular frame by the aid of nano wires, a PVC water pipe is fixed in each position where the rack and the rectangular frame are connected by the aid of nano wires and is distributed on the inner side, a plurality of automatic rotating spray heads are arranged on the water pipes, the lower water pipe is provided with a water inlet and a control valve, and the upper and lower water pipes are communicated with each other through PVC pipes. The maintenance trolley has the benefits as follows: the maintenance trolley is simple in structure, low in manufacturing cost, small in occupied area and space, simple to operate, safe to use, comprehensive in maintenance and capable of moving freely, taking the position conveniently and reducing the labor intensity of workers.