▎ 摘　　要

NOVELTY - Preparing graphene quantum dot comprises (1) dissolving Congo red in deionized water to obtain Congo red aqueous solution; (2) flashing aluminum hydroxide to obtain activated alumina; (3) adding activated alumina to Congo red aqueous solution, mixing, and placing mixed sample in oven at 150°C for drying to obtain a mixture; (4) placing mixture in muffle furnace for thermal catalytic synthesis in air atmosphere of 300-600°C, synthesis time is 30-60 minutes, soaking the thermocatalytically synthesized mixture with water, leaching solution is graphene quantum dot aqueous solution; and (5) freezing and drying the above-mentioned graphene quantum dot aqueous solution, to obtain graphene quantum dot. USE - The method is useful for preparing graphene quantum dot. ADVANTAGE - The method: is simple and efficient. The graphene quantum dot: is high in purity, and emission wavelength includes all bands in the blue-violet light region.