The stress distribution of the high - pressure grinding roller is an important index of the grinding mill design. A simulation model of high - pressure grinding roller is created by means of finite element method (FEM), utilizing the FEM software ANSYS. At first, the paper calculated the pressure of the high - pressure grinding roller by the grinding materiel mathematical model. Secondly, a physical model is set up material characteristics is defined and the areas are meshed, then the border conditions are established, finally loading and solving are made. The result of the FEM simulation indicated the mathematical model of the grinding materiel is rational.