▎ 摘　　要

NOVELTY - Preparation of a multi-element doped graphene quantum dot involves dispersing raw coal with strong acid solution, ultrasonically processing for 1-3 hours, heating to 100-120 degrees C for 20-30 hours, cooling to room temperature, adding strong alkali solution to neutralize the solution, filtering the neutral mixture in 0.45 mu m polytetrafluoroethylene membrane, and dialyzing the mixture using dialysis tubing for 3-10 days to obtain purified product. USE - Preparation of multi-element doped graphene quantum dot (claimed). ADVANTAGE - The method is simple and economical and provides the product with excellent luminescent property.