Argon ion passivation method for hard alloy cutter

The invention discloses an argon ion passivation method for a hard alloy cutter, and relates to the technical field of cutter passivation. The argon ion passivation method comprises the following steps: cleaning a cutter to be passivated; putting the cutter to be passivated into an ultrasonic cleaning pool for ultrasonic cleaning; removing oil and stains from the surface of the cutter to be passivated; then detecting oil stain cleanliness on the cleaned cutter to be passivated; if the detection result is not qualified, conducting cleaning again; and if the detection result is qualified, putting the cleaned cutter to be passivated into a drying machine to be dried to remove moisture. The argon ion passivation method for the hard alloy cutter can be completed in a multi-arc ion plating machine, and investment of equipment such as sand blasting equipment and labor is saved; meanwhile, compared with an existing cutter, the cutter passivated through the passivation method can obtain a better machining effect, and