▎ 摘　　要

NOVELTY - Preparing graphene quantum dot based on leather waste comprises (a) crushing leather waste to obtain broken pieces (b) taking 1-6 pts. wt. pieces, adding 100-300 pts. wt. distilled water, adding 2-4 pts. wt. hydrazine hydrate, ultrasonically processing to obtain dispersion liquid and (c) taking the dispersion into PTFE reaction kettle, performing hydrothermal reaction and filtering the product to obtain graphene quantum dot water dispersion liquid. USE - The method is useful for preparing graphene quantum dot based on leather waste (claimed). ADVANTAGE - The method uses leather collagen fiber containing carbon and nitrogen; recycles leather waste material; and is economical.