Film cutting device of film packer

The invention discloses a film cutting device of a film packer. According to the film cutting device, the structure is greatly simplified, and film cutting is reliable. A cutter holder is fixedly arranged on a machine frame, on the outer side of the film feeding end, of a film feeding unit. A lower cutter with the blade facing the outer side of a cutter roller is fixedly arranged on the cutter holder. An upper cutter used in cooperation with the lower cutter is arranged on the cutter roller, located above the cutter holder, on the machine frame. A first film feeding pressing roller and a second film feeding pressing roller are arranged outside the cutter holder and rotate synchronously in the opposite directions. The first film feeding pressing roller is arranged close to the cutter holder, and film is output between the first film feeding pressing roller and the second film feeding pressing roller, then passes through the lower cutter and the film feeding end of the film feeding unit in sequence and is finally conveyed to a negative-pressure region of the film feeding unit. The cutter roller rotates in the conveying direction of the film and the film can be tensioned among the negative-pressure region of the film feeding unit, the first film feeding pressing roller and the second film feeding pressing roller; the cutter roller rotates, the blade of the upper cutter can be made to be downward and draw close to the blade of the lower cutter to cut the film, and the upper cutter after cutting film continues rotating to be away from the lower cutter.