Vacuum exhaust structure of full-automatic plastic packaging machine

The vacuum exhaust structure comprises the plastic packaging machine, a heat sealing mechanism is arranged in the plastic packaging machine, the heat sealing mechanism comprises a driving motor, a rotating shaft, a rotating block, a moving block, an adjusting strip, a supporting plate, a telescopic sleeve, a telescopic rod and a heat sealing strip, and the driving motor is arranged in the plastic packaging machine; a rotating shaft is arranged on one side of the driving motor, and a rotating block is arranged on one side of the rotating shaft; a switch of a driving motor is turned on, under the action of the driving motor, a rotating shaft can be driven to rotate, then the rotating shaft drives a rotating block to rotate, the rotating block drives a moving block to move, the moving block drives an adjusting strip to move, and under the action of the adjusting strip, a telescopic rod can be driven to move in a telescopic sleeve; therefore, the heat sealing strip is driven to move, and full-automatic heat seali