Preparation method of rare-earth permanent magnet material

The invention provides a preparation method of a rare-earth permanent magnet material. The preparation method provided by the invention comprises an atomized spray coating process and a permeation process, wherein a sintered rare-earth magnet which is subject to atomized spray coating is put into a closed container before permeation; a solution containing a heavy rare-earth element is subjected to atomized spray coating on the surface of the sintered R1-Fe(Co)-B-A-X-M rare-earth magnet; and heat treatment is carried out after baking, so that the heavy rare-earth element which is subjected to spray coating permeates into a grain-boundary phase of the sintered rare-earth magnet. Compared with a traditional technology, according to the preparation method provided by the invention, the amount of the heavy rare-earth element is reduced; the production cost is reduced; in addition, the coercive force of the magnet can be greatly improved under the premise of slightly reducing the residual magnetism; the residual magnetism temperature coefficient and the coercive force temperature coefficient of the magnet are obviously lowered; and the anti-demagnetization capability of the magnet at high temperature is obviously improved.