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Aiming at the high speed operation of no-tillage seeder in corn stubble land in Northeast China, the clogging of seeding and fertilizer touching parts leads to the reduction of the quality of seeding operation, etc., the design of a lateral stubble clearing knife suitable for high speed no-tillage seeding operation was improved. Through the theoretical analysis of bending curve of tangent blade and operation process, the structure and working parameters of the lateral stubble knife were determined, and a discrete element simulation model of the blade-soil-root stubble was constructed for the stubble clearing and anti-clogging device in the field operation process, and the quadratic regression orthogonal center was carried out with the bending angle of the tangent blade of the stubble clearing knife, the operation speed and the knife shaft rotation speed as the influencing factors, and the stubble removal rate, the soil disturbing rate, and the equivalent power consumption as the evaluating indexes. Rotary combination simulation test was done. According to the simulation results of parameter optimization, the prototype was manufactured and field performance tests were conducted, and the results showed that under the conditions of corn stubble coverage of 1.73kg/m2, average stubble height of 400mm, and soil hardness of 20.8kg/cm2, the performance was optimal when the combination of parameter combinations of the bending angle of the cutting edge of 34.5°, the operating speed of 14.4km/h, and the cutter shaft rotational speed of 380r/min were combined. In this case, the root stubble removal rate was 91.6%, soil disturbance rate was 26.6%, and power consumption was 12.62kW; the stubble removal rate of the stubble removal device with optimized stubble removal knives was increased by 12.67% compared with that of the stubble removal device with lateral stubble removal knife blade.