Film passing mechanism

The utility model provides a film passing mechanism which comprises two symmetrical side plates, a packaging film roll is rotationally arranged on one side of the bottom end of each side plate, a driving part for driving the packaging film roll to rotate is arranged on the inner side of each side plate, a first roller is arranged on one side of each side plate, and a second roller corresponding to the first roller is arranged above the first roller. A tensioning roller is arranged between the side plates and staggered with the second roller, the tensioning roller is slidably arranged in the two side plates in the vertical direction, and a third roller, a fourth roller, a fifth roller, a sixth roller and a seventh roller are arranged above the tensioning roller; according to the packaging film tensioning device, the tensioning roller pulls down the packaging film between the second roller and the third roller under the action of gravity, so that the packaging film can be kept tensioned, and the packaging film