Preparation method of composite supercapacitor carbon

The invention relates to a preparation method of composite supercapacitor carbon, which comprises the following steps: S1, cleaning peel, freezing, and freeze-drying; s2, crushing and sieving; s3, mixing with an activating agent CaCl2 and urea, adding into an ethanol solution, and uniformly stirring; performing constant-temperature drying treatment after stirring evaporation treatment under constant-temperature heat preservation; s4, activating and carbonizing in a reaction furnace in an inert gas environment, and cooling along with the furnace; and S5, washing and filtering to be neutral, drying, and cooling along with a furnace. The nitrogen-doped super capacitor carbon which takes the carbon material as the substrate and is high in specific surface area, high in porosity and high in ion transmission rate is obtained through the preparation method of the composite super capacitor carbon, and the super capacitor carbon serves as a super capacitor motor material, so that high specific capacitance and high ene