Pretreatment-free ultra-low-pressure water purification equipment

The invention discloses pretreatment-free ultra-low-pressure water purification equipment, and relates to the technical field of water treatment devices. The output end of the raw water pump is connected with the lower end of the ultrafiltration membrane, the upper end of the ultrafiltration membrane is connected with a water storage tank and a reverse osmosis membrane, the end, away from the ultrafiltration membrane, of the reverse osmosis membrane is communicated with a pure water tank, a constant-pressure water supply pump is arranged on the outer side of the pure water tank, and a plurality of second water using points are arranged at the output end of the constant-pressure water supply pump; and a backwashing mechanism is arranged among the water storage tank, the ultrafiltration membrane and the reverse osmosis membrane. The device does not need pretreatment, can directly perform ultra-low-pressure purification treatment on tap water, is simple in structure and convenient to use, adopts dual filtration