▎ 摘　　要

NOVELTY - Preparing graphene, comprises (i) preparing graphene oxide suspension by adding graphene oxide into a solvent, to obtain 0.25-1 mg/ml graphene oxide solution, and subjecting graphene oxide solution to ultrasonic treatment, and uniformly dispersing graphene oxide suspension; and (ii) adding graphene oxide suspension into a reaction kettle, and then sealing, heating, and pressurizing the reaction kettle, to obtain the primary product graphene, and repeatedly washing the graphene primary product with ethanol, filtering, and drying, to obtain the product. USE - The method is useful for preparing graphene (claimed). ADVANTAGE - The method performs decomposition of functional group of graphene oxide to achieve the reduction process of the target product; releases pressure instantaneously, and the high pressure hot steam rapidly; and prevents the agglomeration of the graphene layers produced under large force, and thus it produces graphene with high specific surface area.