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The utility model relates to a transmission device of a thermal shrinkage mechanism of a cigarette pack thermal shaping machine. The two cams are symmetrically supported on the box body coaxially, and the pneumatic piston controlled by the stop signal shaft is connected with a swinging bracket which is sleeved on the camshaft. The symmetrical ends of the bracket are respectively connected with end plates with oblique edges at the ends. The connecting plates are respectively engaged with the corresponding cams, and the swinging rods of the upper and lower electric heating plate are provided with swinging rods. A tension spring is arranged between the two swinging rods, and the ends of the swinging rods are connected with the corresponding connecting plates and their hypotenuses. . A pendulum rod with a relatively short transmission distance is disposed between the driving swing arm of the upper and lower electric heating plates and the cam, effectively avoiding the springback phenomenon of the connecting rod with relatively long transmission distance in the prior art, so that the present transmission device is configured High-speed cigarette packaging machinery can realize the close contact between the upper and lower electric heating plates and the cigarette packs to ensure the heat shrinking and smoothing effect of the transparent packs of the cigarette packs. The utility model has the outstanding advantages that the high-speed cigarette packaging machine can be adapted and the heat shrinkage and flattening effect of the cigarette paper transparent paper can be guaranteed.