Abstract: Flat seed bed is beneficial to mechanical sowing, and can save water and soil moisture, which is an important condition to ensure the quality of wheat sowing.According to the demands of wheat sowing quality of site preparation for the design and analysis of the flattening parts, rotary tillage leveling device mainly consists of rotary cultivator, suppression of roller, key components in the rotary leveling device rotary knife as a model, USES the EDEM discrete element simulation method, the rotary tillage blade speed, rotary tillage leveling device speed and the Angle of scraping plate surface roughness.The simulation results show that the surface leveling effect is the best and the flatness is 0.3 mm when the rotary tillage knife rotation speed is 310.84 r/min, the forward speed is 1.52 m/s, and the scraping angle is 170°.At the same time, field tests were carried out on the leveling device, and the results were as follows: the average surface flatness was 1.81 cm, which met the flatness requirements before wheat sowing.