The utility model discloses a blockage clearing device for a discharge port of a tank body. The device comprises a driving device at a top opening of a tank body, a stirring device is connected below the driving device; the stirring device extends out of a discharge opening in the bottom end of the tank body; valve connecting devices are connected to the lower ends of the stirring devices; the stirring device comprises a plurality of support rods distributed in a circumferential shape and a spiral stirrer connected into the plurality of support rods; one end of the supporting rod is connected with the bottom face of the driving device, the other end of the supporting rod is connected with the valve connecting piece, the motor is used for stirring oil sludge solid-liquid mixed materials deposited in the tank body to remove a blocked discharging opening, blockage can be removed at any time, the working efficiency is high, and the working environment is safer.