A mounting translation device for a large prefabricated pipe gallery comprises rails and two pushing trolleys; the rails are laid in a mounting foundation pit of the prefabricated pipe gallery; the pushing trolleys travel on the two rails; and the large prefabricated pipe gallery is placed on two pushing trolleys. Compared with the prior art, the mounting translation device has the beneficial effects that the mounting translation device for the large prefabricated pipe gallery adopts the rails laid in the foundation pit, the large pipe gallery is mounted in the foundation pit in a translationmode, the pushing trolleys are simple in structure, the elevation of the pipe gallery is easy to adjust, the mounting accuracy is high, the foundation pit space is saved, construction is convenient, and the efficiency is high. The lifting position of the large prefabricated pipe gallery is jacked up by the pushing trolleys from below through support rods, the mounting elevation of the pipe galleryis adjusted through threads, the precision is quite high, and construction is convenient. When during prestressing connection of the pipe gallery, the stability of an erection structure is quite high, and mounting errors are small.