This packaging machine is an external-type vertical vacuum packaging machine with unique product construction design. It can be used directly on the users' own production lines. Its working head can be freely raised and lowered to suit the product size, provided with single-chip microcomputer system for control. Multiple special functions can be applied without restrictions. It is easy to operate, and is best suitable for vacuum packaging of immovable large products of food, medicine, chemical material and rare earth metal industries.(special size can be ordered)