The invention discloses a pipe network pressure-superposed purification treatment vector secondary water supply system. The pipe network pressure-superposed purification treatment vector secondary water supply system is mainly composed of a backflow prevention device, a water quality purification continuous treatment module, a flow stabilization tank, a non-negative-pressure controller, an ultraviolet light disinfection device, a centrifugal pump, a speed governing permanent magnet motor, a control cabinet, a PC monitoring cabinet and a water supply pipe. The non-negative-pressure controller is installed on the flow stabilization tank and is used for eliminating negative-pressure influences generated by the suction lift when the centrifugal pump works, and non-negative-pressure direct concatenation is achieved; and the centrifugal pump is driven by the speed governing permanent magnet motor. The pipe network pressure-superposed purification treatment vector secondary water supply system has the beneficial effects that the water quality purification continuous treatment module is arranged, so that the water quality purification treatment function is achieved; in addition, non-negative-pressure direct concatenation pipe network pressure-superposed water supply is adopted, so that the advantages of saving energy, water, land and investment, being free of pollution and the like are achieved; the speed governing permanent magnet motor drives the centrifugal pump to conduct variable frequency water supply so that the energy-saving effect of secondary water supply can be further improved; in addition, the system mating function is complete, and the intelligent control degree is high; and the pipe network pressure-superposed purification treatment vector secondary water supply system is safe and sanitary in water supply and good in reliability.