Pig feed packaging negative pressure sealing machine

The utility model relates to the technical field of pig feed packaging negative pressure sealing machines, in particular to a pig feed packaging negative pressure sealing machine which comprises a conveying belt, a vacuum sealing mechanism is arranged on the conveying belt, a supporting plate is arranged on one side of the conveying belt, and a bag opening mechanism with a straightening function is arranged on the supporting plate. The motor drives the lead screw to rotate again, at the moment, rotation of the lead screw enables the bearing block to move upwards, the bearing block enables the limiting base to move upwards through cooperation of the clamping block and the clamping groove, the limiting base drives the supporting block to move upwards through the supporting rod, and due to the fact that extrusion force exists between the supporting block and the bag opening of the feed bag, friction force exists between the supporting block and the bag opening of the feed bag; the bag opening of the feed bag is