The utility model discloses a prefabricated comprehensive pipe gallery mounting machine. The pipe gallery comprises a tire walking system, a main beam supporting leg structure and a pipe gallery lifting and overturning system. The main beam supporting leg structure comprises a main beam, a supporting leg and a cross beam. The two supporting legs on each side are connected through a cross beam located on the lower portion. Main beam is of a double-main-beam structure, each main beam is connected to the top ends of the two supporting legs on one side. The pipe gallery lifting and overturning system is located between the two main beams, the tire walking system comprises a driving wheel set and a steering wheel set, the driving wheel set and the steering wheel set are arranged at the lower ends of the supporting legs respectively, and the pipe gallery lifting and installing system comprises a trolley, a pipe gallery alignment system and a pipe gallery lifting system. Therefore, the pipe gallery overturning and aligning device is compact in structure and convenient to operate, the problem that the space of a construction foundation pit is limited is solved, the whole set of action procedures of pipe gallery overturning, adjusting and aligning can be achieved, construction requirements are met, cost is saved, and the risk that a pipe gallery structure is damaged due to butt joint ofmultiple devices is avoided.