Circulating pressure control water purification secondary water supply system

According to the circulating pressure control water purification secondary water supply system provided by the utility model, raw water is stored in the raw water primary treatment tank and is simply filtered at the same time, water subjected to primary treatment is pressurized by the primary booster pump, enters the primary filter device and is filtered by the filter layer, and then flows into the primary treatment analysis tank; qualified water flows into a second pressure pump to be pressurized; the water subjected to secondary pressurization flows into a nano-filtration device, is filtered by a nano-membrane, flows into a sterilization treatment device for sterilization, flows into a purified water detection pool in a final distinguishing detection pool, is pressurized by a terminal booster pump and flows into a water storage part, and a pressure detection device at the water storage part, the terminal booster pump and a sterilization maintaining device are arranged; the secondary water supply can better