The invention relates to a lubricating oil filter device which comprises a filter screen, wherein the filter screen is a metal wire mesh; filter holes are formed in the filter screen; the filter screen forms a cylinder; one end of the filter screen is connected with a closed plate, and the other end of the filter screen is connected with a fixed ring; the fixed ring is connected with a seal loop through a folding tube; a hole communicated with the folding tube is formed in the fixed ring; the hole is communicated with an oil inlet in the seal loop; a spring is arranged in the folding tube; the two ends of the spring are connected with the seal loop and the fixed ring respectively; connecting rods are arranged between the fixed ring and the closed plate; a seal ring is arranged on the seal loop; the seal ring is a rubber ring; a groove used for accommodating the seal ring is formed in the seal loop; and the seal ring is placed in the groove. The lubricating oil filter device provided by the invention is mounted in the machinery equipment, and the spring between the fixed ring and the seal loop enables that the seal loop to be effectively propped against the mounting part tightly under the action of the elastic force, so that a quite good sealing effect is achieved.