The utility model discloses a novel piston oil ring, which comprises a ring body and a flow guide ring, wherein an annular groove which is coaxial to the ring body is arranged on the outer side surface of the ring body, and a plurality of oil discharge holes are arranged in the inner side surface of the ring body; the ring body is also provided with a ring body opening, and the flow guide ring is arranged in the annular groove and comprises a plurality of V-shaped flow guide pieces which are uniformly arranged in an annular shape; and the adjacent flow guide pieces are connected end to end. The flow of engine oil scraped from a cylinder wall by the piston oil ring is guided by the flow guide ring, so that the engine oil in the piston oil ring quickly flows into an oil pan through the oil discharge holes, and thus the carbon deposits within the piston oil ring are avoided.