▎ 摘　　要

NOVELTY - Preparing nitrogen doped graphene quantum dot involves adding carbon and nitrogen source into round bottom flask, and mixing uniformly. The round bottom flask is stirred and heated until mixture is in molten state. The molten mixture is added in dropwise manner and vigorously stirred sodium hydroxide solution. The liquid solution is adjusted to neutral, to obtain final product. USE - Method for preparing nitrogen doped graphene quantum dot (claimed). ADVANTAGE - The method enables to prepare nitrogen doped graphene quantum dot in simple, and environment-friendly, and cost-effective manner under mild condition, which has produces high yield, good monodispersity and excellent solubility, strong blue fluorescence property, and has very good application prospect in the field of biologic fluorescence labeling and fluorescent probe.