The utility model discloses a short edge flattening structure of a gum dipping glove packaging box packaging system. The device comprises a short edge flattening device, the short edge flattening device comprises a pair of short edge flattening device assemblies which are symmetrically arranged on the rack; each short edge flattening device assembly comprises a first sliding rail, a first slidingbase, a first air cylinder, a second air cylinder, a fifth driving device and a short edge pressing plate. The first sliding rail is arranged on the rack, the fifth driving device can drive the firstsliding base to slide on the first sliding rail in a reciprocating mode, a base plate is arranged on the upper side face of the first sliding base, the middle of the short-edge pressing plate is pivoted to the base plate, and the first cylinder and the second cylinder are located on the two sides of the base plate respectively. The bottom of the first cylinder is hinged to the seat plate; the output end of the first cylinder is hinged to the front end of the short-edge pressing plate; the bottom of the second cylinder is hinged to the base plate, and the output end of the second cylinder is hinged to the rear end of the short-edge pressing plate. Therefore, the short edge pressing plate is driven to press downwards, the short edge of the packaging box can be flattened, and box sealing is facilitated.