▎ 摘　　要

NOVELTY - The preparation method of nano-erbium oxide involves (1) adding inorganic salt aqueous solution of erbium, alcohol solution of graphene oxide, surfactant, and precipitant powder to a grinding cavity of a ball mill equipped with a grinding medium, ball milling in a ball mill for 2-4 hours at room temperature, and leaving still for 3-5 hours to obtain precipitated suspension, and (2) washing the precipitated suspension, drying, calcining, and heat-preserving. USE - Preparation method of nano-erbium oxide. ADVANTAGE - The method enables preparation of nano-erbium oxide with high controllability and improved uniformity, by simple, economical, environmentally-friendly and industrial processes.