Air oxygen concentration control equipment and marine low-speed dual-fuel engine

The utility model relates to air oxygen concentration control equipment and a low-speed dual-fuel engine for a ship, the air oxygen concentration control equipment comprises a main washing device, the main washing device is provided with a first split body and a second split body which are arranged in parallel, the first split body is provided with a first air inlet and a first air outlet, and the second split body is provided with a second air outlet. The second split body is provided with a second air inlet and a second air outlet, the first air inlet and the second air inlet are communicated and connected with an air exhausting device, and the first air outlet and the second air outlet are communicated and connected with an air scavenging device. According to the double-body type main washing device, the first split body and the second split body form the double-body type main washing device, so that the structure of the air oxygen concentration control equipment is more compact, and the axial size of the