Abstract: Through the analysis of the structure and working process of the roller rice mill, this paper simulates and analyzes the working performance of different roller structures by means of numerical simulation, and determines the influence of the whitening pressure and the standard deviation of the whitening pressure on the performance and stability of the rice milling process. The simulation results show that the height of the rolled bar is a direct factor affecting the mean value of the whitening pressure, and the number of rolled bars is directly related to the stability of the whitening pressure. Finally, the design parameters of the rolled bar are 6, the height is 3mm, and the inclination angle is 6 °. At this time, the average whitening pressure is 1.6kpa, and the whitening pressure reaches a high stability.