Excavation-free inner wall cleaning device for municipal water supply and drainage pipeline

The utility model discloses a municipal water supply and drainage pipeline excavation-free inner wall cleaning device which comprises a column barrel filled with clear water and a scrubbing device, sliding grooves are formed in the two ends of the side wall of the column barrel, rotating shafts are rotatably connected into the column barrel at equal angles, and the ends of the rotating shafts arelocated in the sliding grooves. An external thread section is arranged on the side wall of the section, located in the sliding groove, of the rotating shaft, the thread turning directions of the two ends of the same external thread section are opposite, sliding blocks are symmetrically connected into the sliding groove in a sliding mode, threaded holes are formed in the sliding blocks, the external thread section of the rotating shaft is connected with the threaded holes in the sliding blocks in a meshed mode, and a connecting rod is hinged to one end of each sliding block. The municipal watersupply and drainage pipel