For the blocking circumstance in the no-tillage planting operation for grand ridge with crushed raw corn stubble produced by corn harvester in north cold area and slower recovery of ground temperature after planting operation. In order to solve these problems above, an anti-blocking mechanism of no-tillage planter for grand ridge with raw corn stubble was designed. Corn stubble was positioned on the seeding belt, which was continuously struck by the force of cleaning rotating blade on the anti-blocking mechanism. So that the corn stubble reached furrow between adjacent grand ridges, the clean seeding belt on grand ridge was produced for guaranteeing the operation quality of ditch-opening, seeding, soil-covering and compacting. Through theoretical analysis, the key parts of anti-blocking mechanism were designed, and then structure and operation parameters of the mechanism were determined. Orthogonal experiment design of three factors and three levels and fuzzy comprehensive evaluation method were employed for finding the optimal parameter combination of anti-blocking mechanism. Meanwhile, the working speed of equipment, the rotation speed of cleaning blade assembly, the angle between direction of opretion speed and vertical plane rotation axis of cleaning blade assembly were selected as factors. Stubble-cleaning rate, straw-cleaning rate and equivalent power dissipation of anti-blocking mechanism were selected as indexes. The result showed that the working speed of equipment had very significant effect on stubble-cleaning rate. The rotation speed of cleaning blade assembly and the angle between direction of opretion speed and vertical plane rotation axis of cleaning blade assembly had significant effect on the stubble-cleaning rate;the rotation speed of cleaning blade assembly had very significant effect on the straw-cleaning rate. The working speed of equipment, the angle between direction of opretion speed and vertical plane rotation axis of cleaning blade assembly had significant effect on the straw-cleaning rate. The working speed of equipment and the rotation speed of cleaning blade assembly had very significant effect on the equivalent power dissipation of antiblocking mechanism. Within the range of experimental conditions and experiment factors, the optimal combination result of parameters that influencing multi-objective function showed that when the working speed of equipment was 5.4km/h and the rotation speed of cleaning blade assembly was 440r/min, the angle between direction of opretion speed and vertical plane rotation axis of cleaning blade assembly was 20°, the obtained indexes were as follows: the stubblecleaning rate was 93.94%, the strawcleaning rate was 95.39%, the equivalent power dissipation of antiblocking mechanism was 4.36kW, the soil disturbance was 31.9%. The result can provide references for design of no-tillage planter for grand ridge with crushed raw corn stubble produced by corn harvester in north cold area.