The approximate trajectory equation of ball bearing cage centroid motion is fitted, and its coupling with flow field is realized based on unsteady dynamic mesh technique. On this basis, the effects of lubricating oil mass flow rate and rotational speed on lubricating oil atomization characteristics are studied by using VOF to DPM method, and the movement track characteristics of atomized lubricating oil particles are tracked, revealing the influence mechanism of cage movement on bearing lubrication and oil atomization. Further, based on the micro-gap flow control method, the study focused on the characteristics of flow gap blockage or local flow suppression caused by rolling-cage collision contact, and the bearing flow field characteristics and atomized oil flow are compared with those without micro-gap flow control. The results show that the flow field distribution, oil accumulation area and some other key lubrication parameters between the two are significantly different. Finally, the accuracy of the method is verified by comparison with the reference literature. The research results provide a theoretical basis for the oil atomization analysis of ball bearing under oil injection lubrication and the change of bearing oil distribution induced by collision between cage and rolling body. The application of new technology methods in the field of CFD in the field of bearing is discussed, and provide a visual basis for bearing lubrication failure evaluation.