The invention discloses a preparation method of tungsten/rare-earth metal oxide composite hollow spherical powder, and belongs to the field of preparation of inorganic materials. Hydrothermal carbon spheres are taken as a template and are dispersed in a mixed solution of ammonium tungstate and rare earth salts, so that tungstate radicle and rare earth metal ions penetrate into the carbon spheres, and then the carbon spheres is dried after being cleaned; dried powder is heated and preserved heat in a protective atmosphere; a flange is directly opened without performing cooling operation, then air is introduced to carry out secondary calcining; and obtained powder is calcined in two steps in a hydrogen atmosphere to obtain the tungsten/the rare-earth metal oxide composite hollow spherical powder. The material has the advantages that on one hand, spherical morphology can improve the fluidity of the powder, and is convenient for 3D printing forming; on the other hand, doping of rare-earth metal element oxides can refine the grain size of the tungsten, and the strength and the hardness of the tungsten are improved; finally, a hollow structure in particles is introduced, and a raw material is provided for preparing some specific 3D printing devices, such as porous tungsten products.