A fabrication method for a capacitor electrode is disclosed. The fabrication method for a capacitor electrode comprises forming a base polymer layer on an upper surface of the electrode; forming a cation exchanger or an anion exchanger on the base polymer layer; and drying the electrode. The base polymer layer may be formed by any one selected from a group consisting of a doctor blade coating method, a dipping method, a flooding method, a spin coating method, a spraying method, a brushing method, and a painting method. When being used in the water treatment process, the capacitor electrode fabricated using the method according to the present invention can enhance the ion removal rate and reduce power consumption.