Cleaning device for inner wall of long-distance pipeline

The invention discloses a long-distance pipeline inner wall cleaning device in the technical field of pipeline cleaning, and the long-distance pipeline inner wall cleaning device comprises two foam cotton rings and two annular plates, a center shaft is arranged in the middles of the annular plates, and the two foam cotton rings are both fixedly mounted on the outer side of the center shaft; four extrusion net plates are arranged on the sides, close to each other, of the two annular plates through extrusion mechanisms, the foam cotton on the left side is located in a space defined by the four extrusion net plates on the left side, and the extrusion mechanisms are used for driving the extrusion net plates to extrude one of the foam cotton rings when the foam cotton rings move. A water collecting mechanism is arranged on the side, away from the center shaft, of the extrusion net plate, the water collecting mechanism is used for collecting water extruded out of the foam cotton ring, a foam cotton plate is arrange