The stainless steel filter is composed of a casing, a multi-element filter, a backwashing mechanism, and a differential pressure controller. The inner cavity of the stainless steel filter housing is divided into upper and lower chambers, and the upper chamber is matched with the upper chamber. There are multiple filter cores, which make full use of the filter space, which significantly reduces the volume of the filter, and the back chamber has a backwash suction cup. During operation, the turbid liquid enters the lower cavity of the filter through the inlet and enters the inner cavity of the filter element through the partition hole. Impurities larger than the gap of the filter core are trapped, the clean liquid passes through the slit to the upper chamber, and finally is sent out from the outlet.