Air-pressure dredging device

The invention discloses an air-pressure dredging device which comprises air-pressure series and pipe control series components. Air which is pressurized by an inflator arranged in an air bottle shell can flow into an air bag via an air pipe and a skin pipe, and the air bag is communicated with an air pressure gauge, an air valve, an air valve connector, a connecting cap, a hose and an expansion pipe via the air pipe; a flared pipe head is arranged at the lower end of the expansion pipe, and the expansion pipe penetrates a fixing pipe to be connected with a rubber pipe; the upper end of the expansion pipe is closed, is provided with a push-pull rod and is connected with a spiral pipe; the spiral pipe is connected with the upper end of the fixing pipe in a threaded manner. The air-pressure dredging device has the advantages that the push-pull rod and the flared pipe head of the expansion pipe can be driven by the spiral pipe to ascend when a rotary handle upwardly rotates, accordingly, the rubber pipe and sewer pipeline openings can be squeezed to be sealed, standard air-pressure impact force can be kept, and sewer pipelines can be effectively dredged.