▎ 摘　　要

NOVELTY - Method for preparing carbon quantum dots comprises (a) placing carbon material on the carbon cloth to prepare an electrode, and (b) performing electrolysis in an electrolyte with the electrode as the anode to prepare carbon quantum dots, where the carbon material includes undoped carbon and doped carbon. USE - The method is useful for preparing carbon quantum dots. ADVANTAGE - The method uses carbon cloth coating as an anode to prepare carbon quantum dots by electrolytic oxidation and stripping; and is suitable for the preparation of undoped carbon quantum dots as well as the preparation of doped carbon quantum dots; and has a high yield of carbon quantum dots.