▎ 摘　　要

NOVELTY - Preparing graphene aqueous solution involves adding graphene powder to the reaction vessel, adding oxidant to react to obtain a mixed solution, filtering the mixed solution and cleaning to obtain filter cake, adding the filter cake to the water and ultrasonically dispersing uniformly to obtain the graphene aqueous solution. USE - Preparation method of graphene aqueous solution used in coating, composite material, aerospace, and energy battery field. ADVANTAGE - The method has simple preparation process, no need to add dispersant, safe and environment-friendly, low preparation cost, the prepared graphene aqueous solution has good stability, and can be kept for a long time.