Electrochemical deposition of neodymium for increasing the coercive force of rare earth permanent ma

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The present invention relates to a method for preparing a rare earth permanent magnet, especially high-energy rare earth permanent magnet, comprising the steps of : preparing a permanent magnet base of a hard magnetic nanocomposite material having a rare earth base (S1); electrochemically depositing a light rare earth material Nd on the permanent magnet base (S2); performing grain boundary diffusion on the permanent magnet base coated with the Nd (S3); and correspondingly preparing a rare earth permanent magnet.