The pipeline disinfection machine of the preparation water machine disinfects the reverse osmosis membrane and distribution system pipeline, which is non corrosive and non oxidizing, and can extend the service life of the purified water system. Disinfection requires less rinsing (usually 1-2 times), which can effectively save water resources and reduce work intensity. Using green disinfectants is safe and environmentally friendly, with no residue after disinfection, which can reduce the risk of harm to human health and chemical residue.