Novel puncher pin used for leaving waste sheets generated after inner high-pressure forming punching in pipes

The invention discloses a novel puncher pin used for leaving waste sheets generated after inner high-pressure forming punching in pipes. The novel puncher pin comprises a columnar puncher pin body, the lower end of the puncher pin body is provided with a punching face used for being in contact with a to-be-machined workpiece and applying downward punching force to the to-be-machined workpiece, anda groove extending to the side of the puncher pin is arranged on the edge of the punching face. During punching of the puncher pin, waste sheets can be left on a to-be-punched workpiece, and waste sheets are prevented from falling into a mold cavity; by means of the punching process, the mold structure can be simplified, no storage space is arranged in the mold cavity, the mold size can be reduced easily, lightweight and miniaturization design of the mold is achieved, and the mold manufacturing cost is reduced; and in addition, waste postures can be controlled, the situation that waste gets stuck in the mold cavity o