Sewage sampling tank

The utility model relates to a sewage sampling tank in the technical field of sewage sampling, which comprises a supporting mechanism, a sampling tank, a negative pressure pump and an air pipe, the supporting mechanism comprises a bottom plate, a bracket and a supporting rod, the bracket is mounted at the top of the bottom plate, and the supporting rod which is horizontally arranged and used for supporting the sampling tank is mounted at the upper end of the bracket. The sampling tank comprises a tank body, an air pipe connector, a communicating pipe, a supporting block and a water pipe, the air pipe connector detachably connected with one end of the air pipe is installed on the upper end face of the tank body, and the other end of the air pipe is communicated with the air inlet end of the negative pressure pump installed on the support; a communicating pipe is arranged in the center of the bottom of the tank body; in the sampling process, the tank body is positioned above sewage, so that the outer wall of th