Stamping die

The utility model discloses a stamping die. The stamping die comprises a fixed die, a first cavity, a second cavity, a movable die and a core, the first cavity and the second cavity are both arranged on the fixed mold, and the second cavity is communicated with the edge of the first cavity; the movable mold is movably connected to the fixed mold and can move close to or away from the fixed mold; the mold core is arranged on the movable mold, the movable mold can drive the mold core to move to be close to the connecting position of the first mold cavity and the second mold cavity, and the mold core can punch materials on the edge of the first mold cavity into the second mold cavity to be formed. After the back bent pipe serving as a material is placed in the first cavity, the movable mold can move to be close to the fixed mold, and mold closing operation is carried out. In the mold closing process, the mold core can extrude the end of the back bent pipe in the first mold cavity into the second mold cavity, the