▎ 摘　　要

NOVELTY - Preparing composite biological carbon base material involves heating the natural biomass material under the nitrogen atmosphere at heating speed of 3 degrees C/minutes, heating at 700 degrees C, keeping the temperature for 2 hours, cooling to room temperature to obtain carbonized material, soaking the obtained carbonized material in 6 mol/L potassium hydroxide solution for 12 hours, drying to constant weight at 110 degrees C, heating to 700 degrees C at heating speed of 2-3 degrees C/minutes under the nitrogen atmosphere, keeping the temperature for 1-3 hours, cooling to room temperature, cleaning, drying to obtain the activating material, soaking the obtained activating material in 6 mol/L potassium hydroxide solution, adding nitrogen doping agent, stirring uniformly, standing for 12 hours, drying to constant weight at 110 degrees C, heating to 700 degrees C at heating speed of 2-3 degrees C/minutes under the nitrogen atmosphere, keeping temperature for 1-3 hours for mixing nitrogen, cooling to room temperature, and cleaning. USE - Method for preparing composite biological carbon-based material used in super-capacitor, where the composite biological carbon-based material is mixed with acetylene black and polytetrafluoroethylene emulsion, pressed into tablet, and dried to obtain electrode material of super-capacitor (claimed). ADVANTAGE - The method enables to prepare electrode material having good formability, excellent electron transfer capability and porous structure, and has excellent electrochemical performance. DETAILED DESCRIPTION - Preparing composite biological carbon base material involves heating the natural biomass material in nitrogen atmosphere at heating speed of 3 degrees C/minutes, heating at 700 degrees C, keeping the temperature constant for 2 hours, cooling to room temperature to obtain carbonized material, soaking the obtained carbonized material in 6 mol/L potassium hydroxide solution for 12 hours, drying to constant weight at 110 degrees C, heating to 700 degrees C at heating speed of 2-3 degrees C/minutes under nitrogen atmosphere, keeping the temperature constant for 1-3 hours, cooling to room temperature, cleaning, drying to obtain the activating material, soaking the obtained activating material in 6 mol/L potassium hydroxide solution, adding nitrogen doping agent, stirring uniformly, standing for 12 hours, drying to constant weight at 110 degrees C, heating to 700 degrees C at heating speed of 2-3 degrees C/minutes under nitrogen atmosphere, keeping temperature constant for 1-3 hours, doping with nitrogen, cooling to room temperature, washing and drying to obtain the composite biological carbon base material. The nitrogen doping agent is a modified graphene oxide/polyaniline composite material.