The invention provides a prefabricated urban pipe gallery. The prefabricated urban pipe gallery comprises a bottom plate prefabricated block, rib plate prefabricated blocks, bottom side plate prefabricated blocks and a top plate prefabricated block which is mounted on the tops of the rib plate prefabricated blocks and the bottom side plate prefabricated blocks, wherein the rib plate prefabricated blocks and the bottom side plate prefabricated blocks are arranged on the bottom plate prefabricated block, and the rib plate prefabricated blocks are located between bottom side plate prefabricated blocks on two sides of the bottom plate prefabricated block; mortises are formed in the bottom of the top plate prefabricated block, and tenons, which are matched with the mortises, are arranged at the top ends of the rib plate prefabricated blocks and the bottom side plate prefabricated blocks; and a waterstop belt is arranged between each tenon and the corresponding mortise. The pipe gallery provided by the invention in an assembled structural design is simple and convenient to assemble and high in efficiency; and interference of construction operation to traffic is reduced. Meanwhile, the pipe gallery structure after construction is evenly stressed, and the whole structure is high in strength and stable and reliable.