The invention discloses a leveling supporting plate driving mechanism for a gasket stamping die. The leveling supporting plate driving mechanism comprises a lower die seat, a first driving slanting plate and a second driving slanting plate, wherein the lower die seat is horizontally arranged; a slot is horizontally formed in the side wall of the lower die seat; a leveling supporting plate is assembled on the slot in a sliding manner; the first end of the first driving slanting plate is rotationally connected with the lower die seat; the second end of the first driving slanting plate is rotationally connected with the first end of the second driving slanting plate; and the second end of the second driving slanting plate is rotationally connected with the leveling supporting plate. The leveling supporting plate driving mechanism has the beneficial effects that the leveling supporting plate driving mechanism can effectively drive the leveling supporting plate to enter and exit the slot and ensures the time that the leveling supporting plate enters and exits the slot is consistent withthe time that a punch enters and exits a forming through hole, and thus the flatness of a gasket is greatly improved, and the operation efficiency is high.