▎ 摘　　要

NOVELTY - Preparing graphene quantum dot comprises placing the graphite and solid melamine in the ball milling device for the first time ball milling treatment to obtain ball milling mixture A, adding control agent to the mixture A, continuously performing the second ball milling treatment to obtain the mixture B, washing the ball milling mixture B, and placing the ball milling mixture B after washing in the pre-treated dialysis bag, after dialysis treatment, freezing and drying. USE - The method is useful for preparing graphene quantum dot. ADVANTAGE - The method: is simple, the overall preparation process parameters are mild; has high yield of synthesized graphene quantum dots, uniform graphene quantum dots in size, high purity and high synthesis efficiency, and can effectively solve the problems in the prior art. The synthesis process of graphene quantum dots is complicated, the synthesis time is long, the synthesis temperature is too high, and the use of organic solvents or strong corrosive acids leads to the problem of poor environmental performance.