▎ 摘　　要

NOVELTY - Preparing ultrafine graphene powder, comprises: adding a reducing solution and a graphene oxide powder in a sealed reactor, where the graphene oxide powder and the reducing solution are not in direct contact with each other; heating the sealed reactor at an evaporation temperature of the reducing solution, producing vapor by evaporation, and completing the reduction reaction to obtain a colloidal graphene powder; and placing the colloidal graphene powder in a vacuum or protective atmosphere, and then heating at 500-800 degrees C to obtain ultrafine graphene powder. USE - The method is useful for preparing ultrafine graphene powder (claimed). ADVANTAGE - The method is capable of simply, easily, efficiently and economically preparing the ultrafine graphene powder.