The invention discloses an automatic stamping machine capable of effectively stamping coated paper, and relates to the technical field of product packaging. The automatic stamping machine capable of effectively stamping the coated paper comprises a stamping mechanism, an automatic loading component, an automatic labeling component and a pressing component, wherein the stamping mechanism is arranged at one side of an ink box, and a stamp opening for a stamp to be stained with ink is formed in the ink box; the automatic loading component is arranged below the stamping mechanism, the automatic labeling component is arranged at one side of the automatic loading component, the pressing component is arranged above the automatic labeling component, and a plurality of packaging boxes are arranged above the automatic feeding mechanism; and the stamping mechanism comprises a G-shaped groove, a fixing plate, the ink box, the stamp, a long stamping strip, a rotating sliding block, a circular sliding block, a traction rod and a linkage component, the fixing plate is arranged at one end of the automatic loading component, and the G-shaped groove is formed in the fixing plate. The clarity of the stamp can be ensured, the stamp can be prevented from being incomplete, the stamping efficiency is increased, and the attractiveness of the packaging boxes cannot be damaged.