In view of the complex non-linear relationship between shearer mining rate and cutting specific energy consumption in fully mechanized mining face, the optimal combination of shearer motion parameters and geometric parameters is studied in order to improve coal mining rate and reduce cutting specific energy consumption to achieve green mining. The orthogonal virtual experiment of shearer''s working performance is carried out by using the discrete element software EDEM. The evaluation indexes of shearer''s working performance are coal mining rate and cutting specific energy consumption. The research results based on the discrete element method are analyzed by regression method. The regression equation of evaluation indexes is calculated by SPSS software. The three-dimensional contour map is drawn by matlab, and the influence of the research factors on the evaluation indexes is determined. Law. By optimizing the evaluation index, the optimum combination of parameters after shearer rounding is obtained: the drum speed is 74r/min, the diameter of drum hub is 322mm, and the angle of pick lift is 22 °. The coal mining rate is 80.73%, and the specific energy consumption of cutting is 585.26w.h/m3.