▎ 摘　　要

NOVELTY - Preparing a graphene carbon dot-based ink involves: heating an industrial carbon waste in two stages, where the heating rate in the first stage of heating is 1-60 degrees C/minute, and the heating temperature is 400-500 degrees C, and the heating rate in the second stage of heating is 1-20 degrees C/minute and the heating temperature is 800-2300 degrees C, maintaining the temperature for 0.5-6 hours and using an electrochemical method to obtain a graphene carbon dot dispersion; concentrating the graphene carbon dot dispersion by evaporating water, where the step of evaporating water involves heating method such as oven heating, water bath heating or oil bath heating, and the controlled temperature is 60-80 degrees C; and sequentially replacing a liquid container with the same volume as the graphene carbon point dispersion for concentration. The concentration of the graphene carbon dot-based ink is 0.25-82 mg/ml. USE - The method is useful for preparing a graphene carbon dot-based ink, which is useful in three-dimensional printing, gel-based supercapacitors and anticorrosive coatings. ADVANTAGE - The method can reasonably and efficiently reuse industrial waste materials and waste products, has low energy consumption, and is environmentally-friendly.