Jam vacuum packaging machine

The utility model discloses a jam vacuum packaging machine which comprises a vacuum module. The vacuum module comprises a workbench, a vacuum chamber installed on the top of the workbench, a chamber top connected to the top of the vacuum chamber in a sliding and sleeving mode, a piston plate installed in the vacuum chamber in a sliding mode, a shaft rod connected between the chamber top and the piston plate, and two sealing plates attached to the two side walls in the vacuum chamber correspondingly. The two connecting rods are connected between the piston plate and the sealing plate, and the vacuum pump is connected with the top of the chamber roof. In the utility model, when the vacuumizing chamber is required to be vacuum, an external PLC (Programmable Logic Controller) starts the air cylinder, then the chamber top drives the piston plate to ascend through the shaft rod and drives the sealing plate to ascend through the connecting rod, then the vacuum pump moves along with the chamber top, and after the two