▎ 摘　　要

NOVELTY - Preparing graphene comprises: mixing an organic solvent with a graphite powder according to mass ratio of 100-10000:1, stirring the mixture for 0.5-2 hours at -30 degrees C to 0 degrees C, quickly raising the temperature to 100-200?C, and maintaining the temperature for 0.5-4 hours; cooling the mixture, and centrifuging the cooled mixture to obtain a graphene-containing liquid; continuously adding the organic solvent with the liquid, repeating the above steps until a solid residue is disappeared; and filtering the graphene-containing liquid and then washing using ethanol, and drying the washed liquid. USE - The method is useful for preparing graphene (claimed). ADVANTAGE - The method is capable of preparing the graphene in a simple and cost-effective manner with simple structure, less pollution and high quality. DETAILED DESCRIPTION - Preparing graphene comprises: mixing an organic solvent with a graphite powder according to mass ratio of 100-10000:1, stirring the mixture for 0.5-2 hours at -30 degrees C to 0 degrees C, quickly raising the temperature to 100-200?C, and maintaining the temperature for 0.5-4 hours; cooling the mixture, and centrifuging the cooled mixture to obtain a graphene-containing liquid; continuously adding the organic solvent with the liquid, repeating the above steps until a solid residue is disappeared; and filtering the graphene-containing liquid and then washing using ethanol, and drying the washed liquid at 80 degrees C for 12 hours.