The invention discloses an internal combustion engine filter structure. The internal combustion engine filter structure comprises a shell body, the inner wall of the inner side of the shell body is provided with an edge strip, and the edge strip is fixedly connected with a cover body at the upper end through a screw; the cover body is connected with a dirty oil inlet pipe in a penetrating mode, and a fixed buckle is arranged on the edge side of the dirty oil inlet pipe. According to the structure, through the design of a blocking block, a protection ring and leakage holes and the like, the dirty oil can be guided in time to enable the dirty oil to flow along the leakage holes or the edge side of the outer end of the protection ring, so that the contact area between the dirty oil and an inner side of a first filter element and the contact area of an inner side of a second filter element are greatly improved, and the corresponding filtering speed is improved; the shell body and the coverbody, a supporting column and the blocking block and the shell body are in threaded butt joint at the same time correspondingly, moreover, the design of a hole channel and a cavity of the supportingcolumn enable the first filter element, the second filter element, a first filter screen, a second filter screen and an oil absorption cotton layer arranged on the inner side to be replaced regularly,and the service life of the first filter screen, the second filter screen and the oil absorption cotton layer is prolonged, the structure design is compact and reasonable, the practicability is strong, and the structure is suitable for popularization.