The invention discloses a ball bearing motion combination part virtual gradient material modeling and parameter obtaining method. The method comprises the steps of preliminarily analyzing the contactstress of balls and raceways at different phase angles in a ball bearing; constructing a fitting formula of the phase angle and the contact stress between the ball and the raceway; establishing a ballbearing motion joint gradient virtual material simulation model; determining identification parameters required by the gradient virtual material model of the ball bearing motion joint part; determining a parameter value range needing to be recognized and a sampling method for the ball bearing motion joint gradient virtual material model; constructing a mapping relationship between the virtual material to-be-identified parameters and the evaluation indexes based on the agent model; optimizing an extreme point of the evaluation index F, wherein a design variable corresponding to the extreme point is a parameter of the virtual gradient material model of the ball bearing motion combination part; and verifying correctness of parameter acquisition of the virtual material model of each joint part of the ball bearing feeding system through a test. According to the method, the joint virtual model parameters can be accurately obtained.