Activated carbon from waste tea (ACt) is prepared via KOH activation under N2 atmosphere at 800°C. The results of the ACt shows homogeneous and evenly distributed pores so high specific surface area for achieving high-performance supercapacitor electrodes. The maximum specific surface area of 1451.07 m2/g is observed at the mass ratio ACt and KOH 1:3. As the electrode materials, the ACt exhibit ideal capacitive behaviors in H2SO4 electrolyte and the maximum specific capacitance is 162.613 F/g. So the utilization of waste tea for the scalable production of activated carbon for high-performance supercapacitors as low-cost storage devices.