Non negative pressure water supply equipment by the steady flow tank, a vacuum suppressor, variable speed pump unit, a pressure sensor, a frequency conversion control cabinet, a back flow preventing device (optional), a sterilizing device (optional), small flow pressure maintaining tank (optional). Attracted from the municipal pipe network water inlet tube is directly connected to the water inlet of the steady flow tank and the water outlet of the steady flow tank through the disinfection device connected to the pressure pump group of water inlet pipe, the pressurizing unit and a water outlet pipe of users are connected by water pipes, directly to the users of water supply pipe network.