Magnetic particle and its preparation method

The present invention provides a magnetic powder particle and a preparation method thereof, comprising: neodymium or praseodymium neodymium: 20wt% to 30.5wt%, iron: 65.85wt% to 66.95wt%, boron: 0.98wt% to 1.15wt%, dysprosium: 0 wt% to 5.5 wt%, cerium: 0 wt% to 12.5 wt%, cobalt: 0 wt% to 1 wt%, copper: 0.1 wt% to 0.3 wt%, gallium: 0 wt% to 0.2 wt%, zirconium: 0.1 wt% to 0.2 wt% and terbium: 0 wt% to 2.5 wt%. The preparation method comprises the following steps: raw material deslagging; element mixing and raw material-melting, prepared alloy solution refining, alloy solution solidifying into quick condensed sheets, quick condensed sheets crushing for coarse magnetic powder, coarse magnetic powder crushing in winnow system and coarse magnetic powder collecting in separation and collection mechanism. The magnetic powder particle and the preparation method provided by the invention are favorable for preparing the Nd-Fe-B permanent magnet material with high coercive force, high residual magnetism inductance and hig