Anti-overflow fire hydrant

The utility model relates to the technical field of fire hydrants, in particular to an anti-overflow fire hydrant. According to the technical scheme, the fire hydrant comprises a fire hydrant body, a limiting frame and a fixing piece, a second drainage pipe is arranged in the fire hydrant body, and a connecting block is welded to the side end face of the inner wall of the fire hydrant body; a first screw rod is installed in the limiting frame through threads, and a sealing gasket is installed on the bottom end face of the limiting frame in an attached mode. A mounting frame is welded to the top end of the outer surface of the fire hydrant body. A first connecting rod is welded to the side end face of the fixing piece, first drainage pipes are installed at the two ends of the second drainage pipe correspondingly, valves are installed on the first drainage pipes through flange plates, a base is welded to the outer surface of the fire hydrant body, a fixing pin is sleeved with the base, and a second limiting rod