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FIELD : chemistry. SUBSTANCE : method comprises the following steps : crushing recyclable iron-boron-rare-earth element based waste magnets to obtain a powder; obtaining a sintered bar using a powder metallurgy technique, and processing the sintered bar. Processing includes steps for heating the sintered bar which is put into a processing chamber; evaporating material with an evaporating metal containing at least one of elements Dy and Tb, wherein the material with evaporating metal is placed in the same or different processing chamber; bonding atoms of the metal evaporated at the evaporation step to the surface of the sintered magnet while controlling the amount of evaporated metal atoms fed, and diffusion of the bonded metal atoms into intercrystalline regions and/or the intercrystalline phase of the sintered bar. EFFECT : possibility of recycling rare-earth elements contained in a mixture with waste magnets before their reprocessing, while reducing expenses and production equipment. 5 cl, 4 dwg, 1 ex