▎ 摘　　要

NOVELTY - Preparing graphene from lignin involves putting the lignin into a ball mill and milling to 50-500 nanometer, and after the milling, drying in a drying oven at 105 degrees C for 1-2 hours. The lignin powder placed in a mold and pressed at a pressure of 5-10 maegapascal. The lignin flakes placed on a computer program-controlled XY workbench, and used a femtosecond laser to perform laser radiation at room temperature and pressure, and the irradiated raw materials are converted into graphene. The femtosecond laser has a laser wavelength of 1030 nanometer, a laser frequency of 120 kilohertz, and a pulse time of 150 femtosecond. USE - Method for preparing graphene from lignin. ADVANTAGE - The method has cheap and easily available raw materials, mild synthesis conditions, high efficiency, simple operation, and good conductivity of the obtained graphene.