Laboratory waste liquid collecting barrel

The utility model discloses a laboratory waste liquid collecting barrel which comprises a barrel body, the top of the barrel body is provided with a threaded connection port, the threaded connection port is in threaded connection with a barrel cover, the barrel cover is rotationally connected with a rotating piece, the rotating piece is connected with a liquid inlet pipe and an air outlet pipe, the liquid inlet pipe and the air outlet pipe are both connected with one-way valves, and the one-way valves are connected with one-way valves. A one-way valve in the liquid inlet pipe controls one-way liquid inlet, a one-way valve in the air outlet pipe controls one-way air outlet, a manual valve is further installed on the liquid inlet pipe, a vertical pipe is connected between the liquid inlet pipe and the rotating piece, and an anti-overflow device is arranged in the vertical pipe. The device can realize convenient collection and efficient circulation of laboratory waste liquid, and is simple and convenient to oper