Stretch film packaging machine is also called a fully automatic plastic box thermoforming vacuum packaging machine. The principle of the fully automatic stretch film vacuum packaging machine is to use a forming mold to heat the film first, and then use the forming mold to punch it into the shape of the container. Then the packaging is loaded into the formed lower film cavity, and then vacuum packaging is performed. It is mainly composed of vacuum system, pumping gas sealing system, hot pressure sealing system, electrical control system, etc.