Injection piston for pressure casting

The utility model relates to the field of accessories and parts through metal pressure casting or injection die casting, in particular to an injection piston for pressure casting. The injection piston for pressure casting comprises a piston body (1), and is characterized by also comprising a plunger (2), wherein the piston body (1) is a stepped shaft; a chamfer is formed at a corner of a shoulder of the stepped shaft; the middle of the piston body (1) is provided with a through hole (11); the middle of the plunger (2) is provided with a blind hole (21) which is a stepped hole; a chamfer is formed at a corner of a step of the stepped hole; the top of the piston body (1) is connected with the blind hole (21) of the plunger (2) in a sealing manner; the through hole (11) of the piston body (1) is communicated with the blind hole (21) of the plunger (2); and the chamfer at the corner of the shoulder of the piston body (1) is attached to the chamfer at the corner of the step of the stepped hole, namely the blind ho