The nickel oxide was uniformly loaded onto the agave porous carbon by hydrothermal method and then by calcination treatment. The structure and morphology of the nickel oxide/agave-derived porous carbon composites were characterized by X-Ray Diffraction, Scanning Electron Microscope and Infrared Radiation. Furthermore, electrochemical properties of the nickel oxide/agave porous carbon composites were investigated by cyclic voltammetry test and charge-discharge test. The results show that NiO/C-2 has excellent property in energy density and cycling stability, exhibiting energy density of 22 W·h/kg and capacity retention of 91% after 10 000 cycles at a current density of 5 A/g. The specific capacitance of NiO/C-2 is 312 F/g at a current density of 1 A/g, and the capacity is still as high as 155 F/g when the current density is increased to 20 A/g. Therefore, based on the structural stability of agave porous carbon, the appropriate amount of NiO loading can enhance the capacity and cycling stability of the material.