The utility model relates to the printing machinery field, in particular to a stamping mechanism of a plate-making printing integrative machine. The technical proposal of the utility model is as follows: the utility model is provided with a driving gear and a driving bump; a ball bearing which cooperates with the driving bump is arranged on a hanging plate of a stamping support; the hanging plate of the stamping support is corporately connected with a supporting large side plate by a supporting shaft of the stamping support; a left end of the stamping support is fixedly connected with a tension spring; the other end of the tension spring is fixedly connected wit the supporting large side plate. By the technical proposal, the rotation of the driving gear drives the hanging plate of the stamping support to move downward; upward pulling force exerted by the tension spring pulls the hanging plate of the stamping support upward to the original position of the hanging plate; external force can be transferred by the up-and-down rotation of the hanging plate of the stamping support; the external force acts on the paper by a stamping roll, then the operation of the whole stamping mechanism can be realized. The utility model assures that the printing paper can always be contacted with the wax impression on the drum, so, the graphics and words printed out have the same color; furthermore, the printing paper and the drum is not contacted in paper feeding process, which effectively avoids pollution to printing paper caused by ink leakage.