Easily-torn line forming cutter, forming cutting device and application thereof

The invention relates to the technical field of protective film processing, in particular to an easy-to-tear line forming cutter, an easy-to-tear line forming cutting device and application of the easy-to-tear line forming cutter and the easy-to-tear line forming cutting device. The outer side of the small-diameter end of the convex rotating disc is slidably sleeved with a cutter head, a plurality of cutter holders are fixedly arranged on the outer side wall of the cutter head in the circumferential direction in an array mode, arc-shaped cutter bodies are integrally formed at the free ends of the cutter holders, and cutting edges are arranged on the outer arc edges of the arc-shaped cutter bodies and located on the outer side of the rotating track face of the cutter head. A first convex rod is fixedly arranged in the middle of the other end face, opposite to the convex rotating disc provided with the cutter head, of the convex rotating disc, the other end of the first convex rod is in clearance fit in a first