This sealing and corner cutting all-in-one machine is a semi-automatic pneumatic sealing and cutting device specially developed for POF heat shrink film packaging. It integrates the two processes of sealing and corner cutting to be completed synchronously on one machine. It is the preferred supporting model for heat shrink packaging of gift boxes and color boxes, and is widely used in outer packaging plastic sealing operations in industries such as gifts, cosmetics, stationery, medicine, daily necessities and printed picture albums. The equipment adopts a pneumatic drive scheme with stable and controllable sealing and cutting actions and uniform and precise sealing and cutting force, which effectively solves the pain points of edge wrinkles, weak sealing and easy wire drawing of ordinary sealing and cutting machines. With integrated sealing and corner cutting operation, after the operator places and positions the materials, the equipment completes edge sealing and four-corner cutting at one time without multiple processing procedures, greatly simplifying the packaging process and reducing the difficulty of manual operation. New operators can get started with simple training, meeting the requirements of mass packaging production in workshops. The equipment delivers excellent forming effect. Products sealed and cut by this machine will have smooth packaging corners without creases or corner marks after being heated and shrunk in a heat shrink machine. The film fits closely to the box, and the sealed edges and cuts are firm and not easy to crack. The finished products have an exquisite and regular appearance, effectively upgrading the product grade and meeting scenarios with high requirements on packaging appearance such as e-commerce delivery, supermarket display and high-grade gift box packaging. The machine body has a solid and stable structure and is equipped with universal moving casters for flexible movement and positioning in workshops, adapting to different workstation layouts. The equipment is fitted with a safety protection structure for safe and reliable operation and reduced risks caused by misoperation. The model features strong compatibility, suitable for square cartons, gift boxes and boxed products of various sizes with flexible specification adaptation and wide application range. It can meet the packaging demands of switching orders for multiple product categories without frequent replacement of complex accessories. The whole machine is assembled in accordance with export quality standards. Its core components are stable and durable with a low failure rate. It can maintain stable sealing and cutting effect during long-time continuous production. It is easy to maintain and convenient for daily cleaning and upkeep, reducing equipment operation and maintenance costs. Direct supply from the source factory cuts the price difference of middlemen. Sample testing is supported so customers can verify the packaging effect in advance. It can be matched with a heat shrink machine to form a complete heat shrink packaging production line, realizing the whole packaging process from sealing and cutting to heat shrink forming, helping enterprises optimize packaging procedures and improve packaging consistency. For factories and packaging processing plants that need mass heat shrink film packaging for color boxes, this sealing and corner cutting all-in-one machine balances packaging effect, easy operation and equipment stability. Compared with traditional separate sealing machines, it eliminates the manual corner trimming step for more uniform and beautiful finished packages. It is a cost-effective supporting packaging device for heat shrinkage.