Top-shaped air supply-free splitting device

The utility model provides a top-shaped air supply-free splitting device. The air supply-free splitting device comprises a splitting tool rest and a sliding shaft bracket, wherein the splitting tool rest is so structured that three metal strips are connected into a frame by use of shaft holes formed in both ends of the metal strips on the inner sides and two pulley shafts, and a pulley is mounted on the pulley shaft between every two adjacent metal strips; a splitting tool apron is vertically welded on the outer side end of the middle meal strip; a cone-shaped splitting top is formed on the top end of the splitting tool apron; the sliding shaft bracket is composed of two strip-like metal parts as supports, and is fixedly connected to two upright columns on the front end of the frame of a plastic film production host and located under a traction roller; two sliding shafts are fixedly connected in parallel between the two supports. The point of the cone-shaped top is used for splitting and the bottom of the con