▎ 摘　　要

NOVELTY - Preparation of graphene powder involves dispersing expanded graphite or high-purity graphite in an organic solvent under the action of ultrasonic waves, obtaining graphite dispersion solution, placing the graphite dispersion solution in a polytetrafluoroethene high-pressure reaction kettle for acting at high temperature and high pressure, obtaining graphene dispersion solution, performing further ultrasonic dispersion on the graphene dispersion solution, performing centrifugation, collecting upper-layer liquid, and performing suction filtration and freeze-drying. USE - Preparation of graphene powder (claimed). ADVANTAGE - The graphene powder is efficiently prepared with high quality.