The invention discloses a winding mechanism for a cut waste thin film during bag making. The winding mechanism comprises a baffle plate A, a baffle plate B and a guide mechanism, wherein the baffle plate A and the baffle plate B are connected with a rotating shaft of a motor respectively; the guide mechanism is fixedly arranged on a base and comprises a supporting rod and a circular ring which is arranged at the upper end of the supporting rod; the plane of the circular ring is smooth, so that the waste thin film can be conveniently wound on the rotating shaft; when the workload is increased, the baffle plate B moves to increase the distance with the baffle plate A. The mechanism can be connected with two or three pieces of machining equipment to collect the waste thin films produced by the machining equipment. The mechanism is flexibly provided with the baffle plates and the guide mechanism, so that the cut waste thin film during bag making can be quickly, easily and conveniently collected to achieve the purpose of solving the problems of time consumption and labor consumption of the waste material.