Filter filter for oil field injection filtration. The utility model has a pipe body with a square hole on the wall, and two ends of the pipe body are connected with upper and lower end covers opposite to the ring groove, and a wave toothed cylinder with a diamond hole mesh cover is arranged on the pipe body, and the mesh cover and the tooth teeth are arranged on the pipe body. The two ends of the cylinder are embedded and fixed in the opposite ring grooves of the upper and lower end covers, and the insertion tube head of the connecting pipe body is disposed on the outer side of the lower end cover, and a sealing rubber ring is arranged on the pipe head. The filter filter has a simple production process and low product cost, and the filter medium is convenient to be configured according to the filtration precision requirement, and the plug configuration mode facilitates cleaning and replacement of the filter element.

Industrial filter cartridges with filtration accuracy up to the micron level. Between the inner and outer center tube brackets of the filter element, a pleated roll-shaped filter layer is filled, the inner and outer central tubes are densely-opened cylinders, and the outer central tube has a coalescing layer which can accumulate moisture in the oil. The outer side of the coalescence layer is a protective layer, and the end of the filter element is fastened with an end cover. The filter layer is made of a micron-sized glass fiber filter paper layer with a filtering precision, a protective layer composed of a composite non-woven fabric and a protective net inside and outside, and a water-concentrating layer of glass. The fiber mat is the base body, the inner side of the glass fiber mat is lining the non-woven fabric, and the outer side is bound with the protective net on the outer central tube, and the outermost sleeve is cotton sleeve. The filter element of the utility model can work in high alkali concentration, high working pressure and high temperature oil, and the filter material is not deformed and does not break down.