The hydraulic oil filter element is mainly made of stainless steel woven mesh, sintered mesh, and iron woven mesh. Due to the use of filter materials such as fiberglass filter paper, chemical fiber filter paper, and wood pulp filter paper, it has high concentricity, high pressure resistance, and good straightness. Its structure is made of single or multiple layers of metal mesh and filter material. The number of layers and mesh size of the wire mesh during specific use depend on different usage conditions and purposes.