The backwashing pressure difference time and time setting value can be flexibly adjusted according to different water sources and filtration accuracy. The stainless steel filter adopts pneumatic sewage discharge room, the backwashing time is short, the backwashing consumes less water, and is environmentally friendly and economical. The stainless steel filter has a compact and reasonable structural design, small footprint, flexible and convenient installation and movement The stainless steel filter has few wearing parts, no consumables, low operation and maintenance costs, and simple operation and management. The stainless steel filter realizes automatic backflushing through its own detection and strain functions, which can respond to unstable water quality fluctuations without manual intervention.