The invention discloses a controllable punching rod for a punch. The controllable punching rod for the punch comprises a punching rod body; a hollow structure is arranged in the bottom end of the punching rod body; a protruding structure is arranged in the middle of the bottom end of the punching rod body; a piston plate is installed inside the hollow structure; a sealing ring is connected to the side face of the piston plate in a sleeving mode; a push rod which penetrates through the punching rod body and the protruding structure is fixed to the bottom of the piston plate; a rubber ring is fixed to the push rod and located between the portion, inside the punching rod body, of a rod body of the push rod and the inner wall of the punching rod body; and a punching head is fixed to the bottom of the push rod through a connecting plate. The controllable punching rod for the punch acts in the punch and can control the maximum punching degree of punching force, the punching force can be effectively adjusted according to currents and is set according to the mechanical properties of components to be punched, and the controllable punching rod for the punch is provided with a control mechanism and a liquid injection mechanism and is capable of being reused and high in practicability.