本发明公开了一种表面分布稀土氧化物的钛或钛合金球形粉末，该粉末表面弥散分布等效直径为100nm～1000nm，厚度为20nm～50nm的片状稀土氧化物，稀土氧化物的形成改变了粉末的表面性质和粉末之间的粘附性，减少了粉末之间的粘接，使卫星粉的数量减少，粉末质量提高，为钛或钛合金3D打印提供了新的原材料选择。另外，本发明还提供了一种该钛或钛合金球形粉末的制备方法，该方法以钛或钛合金和稀土金属钇、钕、钆作为原料，通过控制真空感应熔炼气雾化制粉的工艺参数，减少了稀土金属在未熔化前发生氧化，提高了熔体的流动性，增大了熔炼室与雾化室的压力差，实现了表面分布稀土氧化物的钛或钛合金球形粉末的制备。

The invention discloses titanium or titanium alloy spherical powder with rare earth oxide distributed on the surface. Flaky rare earth oxide with the equivalent diameter being 100-1000nm and the thickness being 20-50nm is in dispersed distribution on the surface of the powder; and with formation of the rare earth oxide, the surface properties of the powder and the adhesion performance among the powder are changed, bonding among the powder is reduced, the quantity of satellite powder is reduced, the quality of the powder is improved, and a new raw material selection is provided for 3D printingof titanium or titanium alloy. In addition, the invention further provides a preparation method for the titanium or titanium alloy spherical powder. In the method, by using the titanium or titanium alloy and rare earth metals, including yttrium, neodymium and gadolinium, as raw materials and controlling technological parameters of a vacuum induction melting gas atomization powder preparation, oxidation of the rare earth metals before being unmolten is reduced, the fluidity of a melt is improved, a pressure difference between a smelting chamber and an atomization chamber is increased, and preparation of the titanium or titanium alloy spherical powder with the rare earth oxide distributed on the surface is realized.