Movable positioning pin

The utility model provides a movable positioning pin. By the movable positioning pin, the technical problem that the existing rotating handle of a sludge scraper is poor in positioning effect is solved. The movable positioning pin comprises a long bolt, a short bolt and a central shaft, wherein the short bolt is provided with outer threads and inner threads; the outer threads are connected with a rotating handle; the inner threads are connected with the long bolt; the central shaft sequentially penetrates in the long bolt and the short bolt; the rear end of the central shaft extends out from the inside of the long bolt; the front end of the central shaft extends out from the inside of the short bolt; a shaft head handle is arranged at the rear end of the central shaft; and a resetting spring is arranged in the long bolt. The movable positioning pin can be freely positioned, so that the rotating handle can be fixedly positioned at a suitable angle.