▎ 摘　　要

NOVELTY - Preparation of tricolor fluorescent graphene quantum dot powder comprises dissolving citric acid and reducing agent into deionized water to obtain mixed solution, dispersing mixed solution into ultrasonic dispersion, transferring into hydrothermal reaction kettle, hydrothermal reacting to obtain graphene quantum dot solution, washing with ethanol, removing precipitate by centrifugation, subjecting graphene quantum dot solution into ultrasonic extraction and purification to remove impurities, and drying. USE - Method for preparing tricolor fluorescent graphene quantum dot powder. ADVANTAGE - The powder has red, green and blue tricolor fluorescent property, stable structure, uniform size and high quantum yield.