The invention discloses a cataphoresis method for a magnetic steel component. According to the cataphoresis method, an impeller of the magnetic steel component faces downwards, so that a first clamping part and a second clamping part are inserted into two symmetrical air outlets in the magnetic steel component; the suspension end of a third clamping part is propped against the side wall of an annular magnetic steel of the magnetic steel component; in cataphoresis, the current can form a conductive system through the third clamping part, the annular magnetic steel of the magnetic steel component and a cataphoresis liquid; an electric anode, the annular magnetic steel of the magnetic steel component, the cataphoresis liquid and an electric cathode form a closed conductive circulation; the cataphoresis liquid is sedimentated onto the surface of the annular magnetic steel through electron exchange; the contact area of the suspension end of the third clamping part and the annular magnetic steel of the magnetic steel component is no greater than 0.05 mm<2>, and a uniformly distributed coating is formed on the surface of the annular magnetic steel of the magnetic steel component by curing. The cataphoresis method has the advantages that the application of the cataphoresis technology on the magnetic steel component is successfully realized, the coating uniformity of the magnetic steel component and the anticorrosion performance of the coating are improved, harm to the human body is reduced, and the production efficiency is improved.