Sintered Nd-Fe-B materials were cut by electrical discharge machining （EDM）， electroplated diamond wire and internal saw blade， and the morphology and surface roughness of sintered NdFeB magnets cut by EDM， electroplated diamond wire and inner circular saw blade were analyzed. The micro-morphology of cutting tools， surface microscopic morphology and surface roughness of magnets with different processing methods were characterized by using SJ-410 roughness meter and JMS-6010LA scanning electron microscope. The results show that the material etching modes of EDM are melting， gasification and thermal stress. The material etching methods of EDM are melting， vaporization and thermal stress； the material removal methods of inner circular saw blade and plastic deformation. Under different processing methods and cutting speed conditions， the surface roughness of EDM was the highest， and the Ra reaching 7.5 μ m. At 0.15 mm·min-1 cutting speed， the diamond shape of electroplated diamond wire was regular and spherical， and the cutting was face-to-face， and the roughness was smallest. At high cutting speed， the reciprocating motion of electroplated diamond wire has a reversal of the wire saw， which will produce greater normal stress on the workpiece， and the surface roughness value is higher than that of the internal saw blade.
