Prefabricated pipe gallery connecting assembly and overhauling method thereof

According to the prefabricated pipe gallery connecting assembly and the overhauling method thereof, the connecting assembly comprises first protrusions vertically arranged on the edges of the two sides of a pipe gallery channel opening, and a first connecting piece is arranged between the first protrusions of every two adjacent pipe gallery single bodies and can connect every two adjacent first protrusions; a plurality of inclined downward diversion grooves are formed in the two sides of the diversion section from top to bottom, first diversion holes communicated with the corresponding diversion grooves are formed in the diversion section in an inclined downward mode, the first diversion holes are communicated with second diversion holes, and the second diversion holes are communicated with the outer side of the first sealing section in an inclined downward mode. The upper side and the lower side of the joint are connected and sealed through cooperation of the second protrusion and the second connecting piece