▎ 摘　　要

NOVELTY - Preparing graphene comprises taking auxiliary agent and adding deionized water to prepare paste, where the volume mass ratio of water and auxiliary agent (ml/g) is 10-50:1, adding expanded graphite into paste, fully dispersing, allowing to stand, soaking for 8-36 hours, expanding to obtain graphene mixture, adding nitrogen-containing organic solvent to the mixture, where the mass volume ratio (ml/g) of nitrogen-containing organic solvent and expanded graphite is 200-600:1, ultrasonically peeling off, stirring the solution for 0.5-3 hours, removing solvent, and drying to obtain graphene powder. USE - The method is useful for preparing graphene (claimed). ADVANTAGE - The method: utilizes wide source of raw materials; has low production cost; utilizes the solvent, which can be recycled; has simple process; and is easy to process and suitable for large-scale production.