The present invention relates to a method for preparing a disinfectant against African swine fever virus, and a disinfectant against African swine fever virus, prepared thereby. The technical subject matters of the present invention are a method for preparing sodium-free hypochlorous acid water for a disinfectant against African swine fever virus, and a disinfectant against African swine fever virus, prepared thereby, the method comprising the steps of: injecting a hydrochloric acid solution into an electrolytic bath, and then electrolyzing same, thereby preparing an electrolysis product containing chlorine gas; and preparing sodium-free hypochlorous acid water while mixing the chlorine gas, having been separated from the electrolysis product, into distilled water, wherein sodium-free hypochlorous acid water, of which the available chlorine concentration is 78 ppm or 143 ppm, is prepared by controlling the amount of current to be supplied to the electrolytic bath according to the amount of the chlorine gas and the amount of distilled water.
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