Based on the gas-liquid two-phase flow theory of oilgas lubrication, the oilgas two phase flow model in the B7003CY/P4 angular contact ball bearing cavity was established by using COMSOL Multiphysics simulation software, the gas flow velocity pressure and the distribution of lubricating oil in the bearing cavity were analyzed. The distribution of temperature field in the bearing cavity was analyzed by calculating the heat generated by the friction of the bearing and the heat transfer coefficient of the key points in the cavity. The experimental and simulation results show that the lubricating oil enters the bearing cavity along the oil inlet pipe, and a large amount of lubricating oil collects in the front end of the bearing cavity, a little lubricating oil enters the bearing cavity with the air, and the intake speed affects the distribution of lubricating oil. The temperature in the bearing cavity is affected by the speed of the motorized spindle and the intake pressure; as the motorized spindle speed increases, the heat generated by the friction increases, and the temperature inside the bearing cavity increases; as theinlet pressure increases, the air velocity increase, the temperature in the bearing cavity decreases, and the temperature field is closer to the true value after the heat transfer coefficient in the bearing cavity is refined