The invention relates to a stamping machine, and belongs to the mechanical field. The stamping machine comprises a drive gear and a driven gear, wherein the drive gear is connected with a rotary shaft of a motor through a transmission device; the driven gear is fixed on a crankshaft; the drive gear transfers power in a manner of being engaged with the driven gear; the working surfaces of gear teeth on the drive gear are arc-shaped; arc-shaped grooves are arranged in the driven gear; the inner surfaces of the grooves are in close fit with the outer surfaces of the gear teeth when the grooves are engaged with the gear teeth. The gear teeth have the arc surfaces, the gears are engaged through the arc surfaces, the gear teeth form contact through the arc surfaces during the engagement process, and stresses on the parts of the gear teeth are uniform to prevent hard collision among the teeth.