▎ 摘　　要

NOVELTY - The preparation method of graphene involves (1) preparing choline chloride-ligand low-eutectic ionic liquid, drying, adding graphite to the obtained choline chloride-ligand low-eutectic ionic liquid, and ultrasonically processing to obtain graphite-low eutectic ionic liquid dispersion, (2) stirring the graphite-eutectic ionic liquid dispersion obtained in the step (1), centrifuging, collecting the precipitate, washing, drying, ultrasonically processing, dispersing in ethanol, and centrifuging. USE - Preparation method of graphene (claimed). ADVANTAGE - The method enables preparation of graphene with high quality, by simple, economical and environmentally-friendly process.