Retaining ring finishing die

The utility model provides a check ring finishing die. The check ring finishing die comprises a lower die, an upper die, an outer expansion block and an inner expansion block, the upper die comprises an upper die plate, a basin body, a central cone body, an upper base plate, a contraction die petal guide piece, a floating plate, an I-shaped block and a contraction die petal; the outer expansion block and the inner expansion block are fixed into a whole through a fastener, and the bottoms are slidably installed on the top face of the lower cushion block in a matched mode. A wear-resistant bushing is fixedly embedded in the inner inclined surface of the basin body in a matched manner; the center cone is fixed to the center of the bottom face of the upper cushion plate in a matched mode, one side face of the lower end of the center cone is in slope sliding contact connection with one side face of the inner expansion block, and when the center cone moves downwards, the outer expansion block and the inner expansio