R-Fe-B method of preparing a sintered magnet

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A method for preparing a R-Fe-B based sintered magnet, including : preparing a R 1 -Fe-B-M sintered magnet having a thickness of between 1 and 10 mm; spraying a layer of Tb or Dy having a thickness of between 10 and 200 µm on each surface of the sintered magnet in a sealed box under an Ar protection atmosphere by hot spraying method; and transferring the sintered magnet coated with the layer of Tb or Dy to a vacuum sintering furnace, heating the sintered magnet at the temperature of between 750 and 1000°C in a vacuum condition or under the Ar protection atmosphere, and allowing heavy rare earth element Tb or Dy to enter an inner part of the sintered magnet via grain boundary diffusion.