▎ 摘　　要

NOVELTY - Method for preparing high-quality large-size graphene, involves ball-milling original graphite powder for a short period of time to destroy graphite edge structure, and performing oxidation intercalation stripping at low temperature. USE - The method is useful for preparing high-quality large-size graphene. ADVANTAGE - The method recycles and reuses perchloric acid solution, does not involve the process of water washing and waste liquid discharge which avoids the waste of water resources and the pollution of waste liquid to the environment, has almost 100% yield, and is simple and easy to implement, economical and suitable for large-scale production.