The present invention relates to a method for preparing an African swine fever virus disinfectant and an African swine fever virus disinfectant prepared thereby. The present invention comprises the steps of preparing an electrolytic product including chlorine gas by introducing a hydrochloric acid solution into an electrolytic bath and then electrolyzing; A step of preparing sodium-free hypochlorous acid water while mixing chlorine gas separated from the electrolytic product into distilled water, and effective chlorine by adjusting the amount of current supplied to the electrolyzer according to the amount of chlorine gas and the amount of distilled water. A method for producing sodium-free hypochlorous acid water for an African swine fever virus disinfectant, characterized in that producing sodium-free hypochlorous acid water having a concentration of 78 ppm or 143 ppm, and an African swine fever virus disinfectant prepared thereby are the technical gist.
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