The utility model relates to a long wood fiber filter element diesel vehicle PM filtering device. The long wood fiber filter element diesel vehicle PM filtering device comprises a filtering body and a filtering chamber. The filtering body is composed of a barrel-shaped filter element, a metal net inner framework, a metal net outer framework, a front sealing end cover, a back sealing end cover, a guiding cover and the like, wherein the barrel-shaped filter element is composed of long wood fiber and glass fiber. The filtering body is placed in the filtering chamber, under the premise that the filtering body and the filtering chamber are coaxial, and the back sealing end cover of the filtering body is sealed with a connector of an outlet of the filtering chamber. The whole filtering device is placed behind an exhaust pipe with low temperature. The tail gas of a diesel vehicle is guided through a guiding cover, flows into an interior cavity from the outer surface of a filter element cylinder and flows out of an air outlet. When the tail gas flows through the barrel-shaped filter element, PM can be filtered by the long wood fiber and the glass fiber. As the number of filtered particulate matter becomes large, the performance of the filter element degrades, and when the filter element is used to the limitation, the filter element can be replaced, and the replaced filter element can be recycled. The filter element is low in cost and friendly to the environment, the structure of an existing vehicle does not need to the changed, and the discharging quantity of the particulate matter of the diesel vehicle is effectively reduced.