Porous spherical carbon was prepared by using petal-spherical polyaniline (PANI) as a precursor through carbonization and activation with KOH. The morphology, structure and surface chemical composition were analyzed by scanning electron microscopy (SEM), transmission electron microscopy (TEM), N2 adsorption-desorption, X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The influence of carbonization temperature on electrochemical performance of porous carbon was also investigated. For the obtained spherical particle with the small diameter of about 2 μm, large specific surface area was up to 2 496.6 m2/g, and some optimized porous was also distributed at the carbonization temperature of 750 ℃ and activation temperature 850 ℃. Meanwhile, the synthesized porous carbon exhibited a high specific capacitance up to 247 F/g at 0.5 A/g, and 182 F/g even at a high current density of 20 A/g, which indicated good rate capability. Moreover, 102% of the initial specific capacitance was retained after 1 000 cycles at a high current density of 10 A/g.