Sewer line dredging device

The invention relates to pipeline dredging apparatus, in particular to a sewer line dredging device. According to the sewer line dredging device, hydraulic pressure of water flow can be sufficiently utilized for accumulating energy and releasing potential energy to dredge foreign matter in a sewer line. The sewer line dredging device comprises a water storage and energy accumulation tank, a waterpipe, a water draining switch, a water inlet switch, water inlet pipes, a press plate and a sealing pad, and is characterized in that the water pipe is connected with the lower end of the water storage and energy accumulation tank; the water draining switch is connected with the lower part of the water pipe; a sewer pipe is connected with the lower end of the water draining switch; the press plateis connected with the lower part of the sewer pipe; the sealing pad is connected onto the sewer pipe at the lower part of the press plate and used for performing the sealing function when butted witha dredged pipe; the two wa