▎ 摘　　要

NOVELTY - Preparing graphene quantum dot involves dispersing expanded graphite in sodium dodecyl sulfate aqueous solution at low temperature, subjecting to ultrasonic treatment and centrifugation treatment, filtering supernatant to obtain bright light black solution. The bright light black solution is added in deionized water for dialysis to remove soluble impurities of sodium dodecyl sulfate to obtain bright light gray graphene quantum dot solution. USE - Method for preparing graphene quantum dot. ADVANTAGE - The method enables to prepare graphene quantum dot that has controllable operation, economical efficiency and high quality product yield, and in simple manner.