The chestnut shell was selected as the carbon source (CC) and KOH was used to activate the carbonization products. The morphology and performance of electrode materials (CC700-OH) were tested. It was found that CC700-OH has a layered structure with holes / sheets interspersed, with a specific capacitance of 540 F/g at 1 A/g. Capacitor can still maintain 98% of initial value after 6000 cycles. In a two-electrode system, CC700-OH// CC700-OH symmetrical capacitor was assembled and has a specific capacitance of 106 F/g at 1 A/g and the potential window width is 0 to 1.6 V. When the power density is 800 mW/g, the energy density is 37.3 to mW•h/g and when the power density is increased to 12000 mW/g, the energy density can still be maintained at 23 mW•h/g. The above research results show that it is feasible to prepare symmetrical supercapacitor electrode materials using chestnut shell as carbon source.