Abstract: Aiming at the problem of significant increase of churning torque in mechanical transmission components under low temperature, research on churning torque suppression method of mechanical transmission system was carried out. First, the contact angle and surface morphology of the prepared chemical nickel-plated Teflon coating were tested to elucidate the loss suppression mechanism of the oleophobic interface. The oil bath lubrication flow field and churning torque of the coated and uncoated disk were compared with those of the coated disk by using the thermostatic visual churning test chamber, and the effects of different rotational speeds, oil temperatures, contact angles and oil immersion depths on the reduction of churning torque were analysed by using the Moving Particle Semi-implicit (MPS) method. The results show that the contact angle of the nickel-plated Teflon coated surface was increased from 7.8° to 31.2°, the pressure, vorticity and oil flow around the disc in the flow field were reduced, and the reduction of churning torque in the experimental values was 31.7%−48.5%. At different speeds, oil temperatures and immersion depths, the churning torque showed a reduction effect of 29.6%−44.6%, 40.7%−44.7% and 42.5%−49.5% respectively, and as the contact angle increased, the drag reduction effect tended to saturate and, in addition, the PTFE reduced the oil flow around the disk, which provides a new perspective and theoretical basis for the suppression of churning torque of the mechanical transmission system at low temperatures.