The invention relates to the technical filed of vacuum plating, in particular to a preparation method for conducting vacuum compound plating on the surface of a
neodymium iron
boron magnet, which is characterized in that the preparation method comprises the following steps: A. pre-treatment, the mixed liquor of washing liquid and
purified water is used for conducting oil removal and parting medium washing to the
magnet surface in an ultrasonic wave cleaner; B.
ion cleaning and activation, the pre-treated
neodymium iron
boron magnet which is dried at 80-100 DEG C for 5-10 minutes undergoes bombardment activation of a
glow plasma in vacuum environment, so as to increase surface
activation energy; and C. vacuum plating, vacuum plating treatment is conducted to the
neodymium iron
boron magnet washed by ions in a
vacuum chamber, and a
metal plating is prepared on the surface. The deposited
metal film on the surface of the
neodymium iron boron magnet has the advantages of good stability, high bonding force and tightness, stronger anti-
corrosion performance in cold and hot alternation environment. Furthermore, in the
physical vapor deposition plating process, the plating thickness is affected much less by the magnet workpiece corner than in
electroplating and
chemical plating, and the
pollution problem is avoided in the preparation process.