Method for preparing rare earth permanent magnet

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A rare earth permanent magnet is prepared by providing a sintered magnet body consisting of 12-17 at% of rare earth, 3-15 at% of B, 0.01-11 at% of metal element, 0.1-4 at% of O, 0.05-3 at% of C, 0.01-1 at% of N, and the balance of Fe, disposing on a surface of the magnet body a powder comprising an oxide, fluoride and/or oxyfluoride of another rare earth, and heat treating the powder-covered magnet body at a temperature below the sintering temperature in vacuum or in an inert gas, for causing the other rare earth to be absorbed in the magnet body.