The utility model discloses a punch self-centering device of a blank punching hole of a fast forge machine, comprising a lifting mechanism, a clamping mechanism and a rotating mechanism, wherein the lifting mechanism is fixed under the clamping mechanism and can lift the clamping mechanism vertically to regulate the height of the clamping mechanism, and the rotating mechanism is positioned on the side surface of the lifting mechanism and can drive the lifting mechanism to rotate, thereby the clamping mechanism is driven to rotate for an angle, and a punch clamped by the clamping mechanism just drops on a center position of the blank punching hole of the fast forge machine. The punch self-centering device of the blank punching hole of the fast forge machine is mainly used for punching a blank of the fast forge machine, when the blank aims at the punch, the punch can be quickly and exactly aimed at the center of the blank without manual operation, and the punching operation is easy to realize.