Positioner and welding production line

The utility model provides a positioner and a welding production line, and belongs to the technical field of welding devices. The turnover mechanism is arranged on the base; the first turntable is connected with the turnover mechanism; an avoiding hole is formed in the middle of the second rotating disc; the first annular blocking piece is arranged on the first rotating disc, and the second annular blocking piece is arranged on the second rotating disc; the drag chain structure is suitable for containing a cable, one end of the drag chain structure is connected to the first annular blocking piece, and the other end of the drag chain structure is connected to the second annular blocking piece. According to the positioner provided by the utility model, the mounting hole is formed in the first turntable, and the avoiding hole is formed in the second turntable, so that a welding gun can extend into the positioner from the bottom of the positioner for welding when an internal welding seam is welded, and the weldin