Ultrafiltration (UF) technology is widely used with large water yield and filtration precision of 0.01~0.1 μ m. It is a membrane separation technology using differential pressure, which can filter out harmful substances such as rust, sediment, suspended solids, colloids, bacteria, viruses, macromolecular organics, and retain some mineral elements beneficial to human body. It is the core component in the production process of mineral water and mountain water. The recovery rate of water in ultrafiltration process is more than 95%. The utility model can realize flushing and backwashing conveniently, is not easy to block, and has a relatively long service life.