Annular cutter device for plastic pipe film

The utility model relates to an annular cutter device for a plastic pipe film, which is characterized by comprising a positioning frame, a rotary cylinder, a rotary driving mechanism, a swing arm and an elastic pulling piece, the rotary cylinder is rotatably arranged on the positioning frame and is in driving connection with the rotary driving mechanism, the swing arm comprises a short straight arm and a long arc-shaped arm which are integrally formed, and the short straight arm is connected with the long arc-shaped arm. One end of the short straight arm is connected with one end of the long arc-shaped arm, the short straight arm, the long arc-shaped arm and the elastic pulling and holding piece are arranged around a port of the rotating cylinder, the joint of the short straight arm and the long arc-shaped arm is hinged to the end face of the rotating cylinder, and the hinged center line is coaxial with the rotating center line of the rotating cylinder. And two ends of the elastic pulling and holding piece ar