Considering the current status associated with the difficult extraction of rare earths in NdFeB magnet scraps in terms of economy and efficiency, rare earths were selectively separated from NdFeB magnet scraps by sulfating roasting. Fe2(SO4)3 was found to induce the sulfate transformation of rare-earth oxides, significantly reducing the amount of sulfuric acid. Almost 98% of rare earth oxides were transformed to soluble rare earth sulfate by the combined action of H2SO4 and Fe2(SO4)3 under conditions of a theoretical amount of sulfuric acid of 2.0 times, a roasting temperature of 750℃, and a roasting time of 1.5 h, while less than 0.1% of iron was leached, mainly existing in the form of a residue as a hematite (Fe2O3) phase; this hematite phase can be easily smelted in iron works. As a result, the reduction of sulfuric acid and the comprehensive utilization of NdFeB magnet scraps are achieved.