An electrolytic water sterilization device was developed that employs CNT (carbon nano tube) as a cathode. CNT plastic composite material is pulverized with a waterdispersible acrylic anionic resin added with castor oil and a dispersion, polypropylene resin mixed with CNT, and thermoplastic elastomer to make pellets. This CNT composite material is a metal-free electric conductor with excellent chemical resistance and surface electrical resistance of 1Ω/□ or less. When this electrolytic water sterilizer was used as cleaning water for dental treatment and sink cleaning water, it was eco-friendly and showed excellent removal rate. This device can effectively remove pesticides from fruits, etc. and remove bacteria by washing pork. In addition, the water in the swimming pool can be sterilized and purified without using chemicals. In this case, environmental conservation and economic costs can be reduced by not generating wastewater that causes environmental pollution