Positioning device for lathe machining of cylinder sleeve

The utility model belongs to the technical field of lathe machining equipment, and particularly relates to a positioning device for lathe machining of an air cylinder sleeve, which comprises a base, a moving seat is fixedly arranged on the upper side of the base, a moving block is movably arranged in the moving seat, a connecting seat is detachably arranged on the upper side of the moving block, and the connecting seat is fixedly connected with the base. A positioning block is detachably arranged on the upper side of the connecting base, a connecting groove is formed in the upper side wall of the connecting base, a connecting block corresponding to the connecting groove is arranged at the bottom of the positioning block, and a limiting groove is transversely formed in the side wall, attached to the connecting base, of the connecting block. Firstly, the positioning block can be combined with the connecting base through matching of the connecting block and the connecting groove, the position of the connecting b