Preparation method of samarium oxide spherical particles

The invention discloses a preparation method of samarium oxide spherical particles, which comprises the following steps: 1) at 50-70 DEG C, dropwise adding a samarium chloride solution and an ammonium bicarbonate solution into a reaction container containing a base solution in a parallel flow manner; after dropwise adding is finished, continuously stirring and reacting for 10-120 minutes to obtain a reaction suspension; 2) carrying out solid-liquid separation to obtain a first solid; roasting the first solid to obtain samarium oxide spherical particles; wherein the molar ratio of Sm < 3 + > in the samarium chloride solution to CO3 < 2-> in the ammonium bicarbonate solution in the parallel flow dropwise adding process is controlled to be 1: 2.7-3.6; the pH value of a reaction system is controlled to be 5.0-6.5 during parallel flow dropwise adding; the base solution is water; the volume of the base solution is 10-30% of the sum of the volumes of the samarium chloride solution and the ammonium bicarbonate soluti