The utility model discloses an injection die is annotated to check valve, including the fixed die plate, the mould foot, the lower extreme both sides of fixed die plate are provided with the compact heap, be provided with movable mold cavity plate between fixed die plate and the compact heap, movable mold cavity plate's below is provided with the movable mould and breathes out husband's piece, still be provided with oblique guide pillar on the fixed die plate, be provided with the ejector pin retaining plate between the mould foot, the middle part of ejector pin retaining plate is provided with the push rod, the both sides of ejector pin retaining plate are provided with the return pin, cup joint on the return pin and be provided with back spring, the upper end of mould foot and movable mould are breathed out and are provided with the movable mould backing plate between husband's piece, the position department that the fixed die plate corresponds the push rod is provided with the core, the top of push rod is concave sphere, be provided with the blade in the concave sphere. The utility model discloses simple structure, reliable operation, through setting up the blade on the push rod, the joint -cutting process can be accomplished to the function that makes injection mold have cutting process when the injection, effectively solve the quality of joint -cutting, simplifies manufacturing procedure, simultaneously very big improvement work efficiency, reduce the processing cost.