Positioning device for seamless steel tube machining

The invention relates to the technical field of seamless steel tubes, in particular to a positioning device for seamless steel tube machining. The technical problem to be solved is that the length of a pipe suspension part of an existing device is fixed and cannot be changed. In order to solve the technical problem, the positioning device for seamless steel tube machining comprises a sliding rail, a sliding clamping set and a fixed clamping set, and the sliding clamping set and the fixed clamping set are consistent in structure; fixing main holes are formed in the front face and the back face of the inner wall of the sliding rail at equal intervals, the two sides of the front face of the sliding rail are movably connected with belt wheels through pin shafts, the belt wheels are in transmission connection through a double-face toothed belt, the inner wall of the sliding rail is slidably connected with a positioning sliding block, fixing auxiliary holes are formed in the front face of the positioning sliding bl