The invention discloses an urban branch underground comprehensive pipe gallery structure system, and belongs to the technical field of underground pipe gallery water prevention. The urban branch underground comprehensive pipe gallery structure system comprises an upper cabin and a lower cabin; the upper cabin and the lower cabin are vertically overlapped; the lower cabin is cast-in-place admixturetype all-rigid self-waterproof concrete; the pipe length of the lower cabin is between 150 and 300 m; the lower cabin comprises a rainwater cabin and a sewage pipe; the upper cabin is prefabricated by adopting admixture all-rigid self-waterproof concrete and comprises a plurality of pipe cabin sections; adjacent pipe cabin sections are spliced in a sealed manner; and the upper cabin internally comprises a gas pipe cabin and a cable cabin. The urban branch underground comprehensive pipe gallery structure system adopts a structure with the upper cabin and the lower cabin; the lower cabin is cast in place, and the upper cabin is prefabricated and spliced; a splicing seam adopts a composite waterproofing technology; and the overall cost of an underground pipe gallery can be effectively reduced and the water preventing effect of the pipe gallery can be effectively guaranteed.