Pipe barrel inner wall automatic polishing device

The invention relates to a pipe barrel inner wall automatic polishing device. The pipe barrel inner wall automatic polishing device comprises a machine body, at least three supporting wheel sets, a rotary disk and a grinding structure, wherein the machine body is arranged in a pipe barrel; the at least three supporting wheel sets are arranged on the pipe barrel at intervals in the circumferentialdirection; the at least one supporting wheel set is provided with a driving wheel used for driving the machine body to move in the axial direction of the pipe barrel; the rotary disk is rotatably assembled to the machine body; and the grinding structure is arranged on the rotary disk and used for polishing the inner wall of the pipe barrel in the rotating process. The grinding structure arranged on the machine body rotates in the circumferential direction of the pipe barrel when the rotary disk rotates so as to conduct grinding on the inner wall of the pipe barrel. The machine body is providedwith the supporting wheel