Using hypochlorous acid water for disinfection does not need to avoid workers. It can be disinfected for cooling workshop, packaging workshop, finished product warehouse, raw material room, breeding farm and food processing. The Japanese health department and FDA of the US Food and Drug Administration stipulate that only hypochlorous acid can be used as a food additive and an indoor spray air disinfectant. The disinfection and sterilization efficiency is high. After disinfection, it is decomposed into water, which is environmentally friendly and harmless to people.