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In view of the problems such as easy blockage of opener and poor sowing quality when corn no tillage planter works at high speed in Huang-Huai-Hai region of China, an active anti blocking device with shallow rotating strip was designed based on the anti blocking theory of rotary tillage. According to the situation of wheat seedling belt in wheat and corn planting mode in Huang-Huai-Hai region, the knife layout structure and cutter shaft speed of the anti blocking device were designed; the rationality of the structural parameter design of the anti blocking device was determined by analyzing the straw flow, throwing track and force, and the key factors affecting its performance were tested in soil bin; the discrete element simulation and multi factor orthogonal test were carried out selecting the cutter shaft spacing, cutter shaft speed and forward speed as the influencing factors, taking the straw cleaning rate and soil breaking rate as the performance evaluation indexes, the cutter shaft spacing and working parameters of anti blocking device were optimized. The results of simulation test showed that the comprehensive operation quality was the best when the rotation speed of cutter shaft was 800r/min, the distance between cutter shafts was 70mm, and the forward speed was 7km/h. The field experiment of corn sowing was carried out on the optimized results. Under the operation conditions of straw mulching amount of 1.02kg/m2 and forward speed was 8km/h, the rate of removing straw was 91.85%, the stability of ditch depth was 86.67%, and the rate of excavation was 26.47%, which could meet the requirements of highspeed operation.