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To solve the problem that the traditional mechanical seed metering device was difficult to replace during working, the structural parameters of the key components of the seed metering device were determined by theoretical analysis method to design a combined seed metering device. EDEM discrete element software was used to complete the universal orthogonal rotation combination test with the rotation speed of seed metering, the diameter of hole and the depth of hole as influence factors. The design data were analyzed by Design Expert 8.0.6 software, and the influence factors were obtained. The regression model among the performance indicators was ranked, and the target parameters were optimized based on the regression model to determine the optimal combination parameters. The results show that when the rotation speed of the seeding wheel is 40.38 r·min-1 with the hole diameter of 9.94 mm and the hole depth of 8.47 mm, the predicted yield is 96.24%. Based on the results, the bench test can be carried out and can verify the simulation results. [ABSTRACT FROM AUTHOR]