Disclosed is the sanitation water supply system. The system is mainly comprised of a vacuum suppressor, a steady flow compensator, a water inlet, a small flow pressure cavity, a small flow air bag, a small flow inlet and outlet water pipe, a water outlet, a steady flow compensator airbag and a vacuum suppress chamber. Water inlet links to tap water pipe network while water outlet links to main inlet pipe of the water supply equipment. Steady flow compensator and small flow pressure cavity are filled with airbag and separate domestic water from water supply equipment for eliminating water contamination caused by long-term contact between water and water supply equipment, and for safe and clean water by putting an end to the reduction of air dissolved in water gradually in vacuum pressure cavity.