Abstract: In order to address the issue of difficult particle removal during electrical discharge machining milling of sintered NdFeB, a transverse rotating magnetic field is introduced. Comparative experiments are conducted among no magnetic field processing, constant transverse magnetic field-assisted processing, and rotating transverse magnetic field-assisted processing to analyze the effects of processing parameters on material removal rate, surface roughness, and electrode wear rate. From the perspective of the forces acting on positive ions, the differences in material removal rate, electrode wear rate, and surface roughness among these methods of no magnetic field, constant transverse magnetic field-assisted, and rotating transverse magnetic field-assisted electrical discharge milling of sintered NdFeB are analyzed. The results indicate that rotating transverse magnetic field-assisted electrical discharge milling achieves higher material removal rate, better surface roughness, and lower electrode wear rate.