Performance of thrust bearing in high speed precision grinding roller is an important factor that affects the stability and precision of roll grinder processing. Roynolds equation is the basis of the calculation of oil film pressure of journal bearing. Based on the finite difference method, the non dimensional treatment of Roynolds equation is carried out. With the aid of MATLAB software powerful symbolic operation, numerical calculation and graphics visualization processing function, programming calculation was done，and two dimensional flow Roynolds equation of the thrust bearing in high speed precision grinding roller were solved. Solution results show: Hydrostatic thrust bearing has high bearing capacity and high oil film rigidity, Rotary accuracy and motion accuracy of the grinding wheel spindle is ensured. The research results have certain reference value for the overall design of high speed roller grinding machine.