Positioning clamp with self-locking limiting structure for paper package production

The utility model discloses a positioning fixture with a self-locking limiting structure for paper package production, which belongs to the technical field of positioning fixtures and comprises a base, guide rods are fixedly mounted on the upper end face of the base close to two sides, and a screw is rotatably mounted on the upper end face of the base close to the middle. A positioning plate is arranged between the two guide rods and the screw rod, and a rotary drum is arranged on the screw rod; a movable groove is formed in the rotating cylinder, a toothed plate is fixedly installed at the position, close to the lower end, of the inner surface of the movable groove, a circular plate is fixedly installed on the upper end face of the screw rod, a toothed groove is formed in the side face of the circular plate, and a limiting rod penetrates through the interior of the circular plate and is fixedly installed at the upper end of the inner surface of the movable groove; and a spring is fixedly mounted between the