The vacuum packaging machine is composed of a vacuum system, an air extraction and inflation sealing system, a heat-sealing system, and an electrical control system. The external suction vacuum packaging machine automatically seals the package immediately after creating a low vacuum inside the packaging bag. For certain soft foods, packaging with a fully automatic vacuum packaging machine can reduce the package volume, making transportation and storage more convenient. The principle of the desktop vacuum packaging machine involves using plastic composite film or plastic-aluminum foil composite film as packaging materials to perform vacuum packaging or vacuum air extraction packaging for solids, liquids, powders, pastes, such as food, chemical products, electronic components, precision instruments, and rare metals.