Positioning tool used for empennage frame spot welding

The utility model relates to a positioning tool used for empennage frame spot welding, and belongs to the field of welding. The positioning tool comprises a rotation disk, a tight-holding mechanism, a positioning table, a supporting frame and a compressing mechanism. The supporting frame is fixed onto the rotation disk, the tight-holding mechanism is fixed onto the lower surface of the supporting frame, and the compressing mechanism is connected to the upper end of the supporting frame. When a workpiece to be welded is held up by the tight-holding mechanism to be positioned, a supporting block is inserted into the workpiece to be welded. The compressing mechanism moves downwards under the control of an air cylinder and compresses the rear end of the supporting block, and by rotating the rotation disk, all spot welding operations are completed. The positioning tool provides effective positioning during empennage cylinder welding and supporting block spot welding, realizes semi-automation, greatly reduces the l