Pipeline rust remover

The utility model provides a pipeline derusting device and relates to the field of pipeline derusting devices, the pipeline derusting device comprises a supporting ring frame, four sliding grooves are formed in the supporting ring frame in a surrounding and penetrating mode, four positioning square sleeves are welded to the circumferential inner wall of the opening position of the rear side of the supporting ring frame in a surrounding mode through four L-shaped supporting rods, and four sliding plates are installed on the four positioning square sleeves in a penetrating and sliding mode; the head end sections of the four sliding plates are each rotationally provided with a rubber wheel, the four rubber wheels are in sliding fit with the four sliding grooves, and the four rubber wheels make extrusion contact with the inner wall of the pipeline to be polished and derusted when sliding and stretching out. A cross-shaped support is welded in an opening in the front end of a supporting ring frame, a mounting disc