Unblocking device for sewer

The utility model relates to a dredger for a sewer, which is connected with a pressurizing conduit pump, spheroidicity rubber bag and a sealing bowl. When dredging, a rubber pipe is communicated with tap water, the conduit pump is switched with a power supply to works, the sealing bowl aims at the leakage opening of the sewer and is pressed. The stemming in the sewer is dredged by making use of pressure generated from tap water and the conduit pump and instant high voltage impact generated by repeatedly pressing the rubber bag by hands or treading the rubber bag by feet. The device can cleanly and thoroughly clear the stemming in the sewer and can also realize dredging conduits with a plurality of bends and stemming which is far away from the leakage opening of the sewer. Therefore, the utility model is used for dredging stemming in various sewers.