The stainless steel filter is composed of a shell, a multi-element filter element, a backwash mechanism, and a differential pressure controller. The inner cavity of the stainless steel filter shell is divided into upper and lower chambers by a diaphragm in the stainless steel filter shell. The upper chamber is equipped with There are multiple filter elements, which makes full use of the filter space and significantly reduces the size of the filter. A backwash suction cup is installed in the lower chamber. During operation, the turbid liquid enters the lower chamber of the filter through the inlet, and then enters the inner chamber of the filter element through the partition hole. Impurities larger than the gap in the filter element are trapped, and the clean liquid passes through the gap to the upper chamber, and is finally sent out from the outlet.