In order to solve the problem that the size difference of hybrid garlic led to the low qualified index of single grain and the high omission-sowing index, a kind of garlic seed platter with air suction assisted by seed disturbing teeth was designed. Hybrid garlic was taken as the research object, and the working principle of seed stirrer assisted by air suction type garlic seed platter was described. Based on the physical characteristics of hybrid garlic itself and the requirements of agricultural planting, the surface equation of seed disturbing tooth was constructed to determine the key structural parameters of seed platter. On this basis, the seed selection qualification index was taken as the test index, and the seed arrangement process was simulated and analyzed based on EDEM software to determine the optimal structural parameters of the seed disturbing teeth. At last, the performance of hybrid garlic was studied with the operating speed, the rotation speed of seed platter and the vacuum degree as the test factors, and the high qualification index and low omission index as the test indexes. Based on the optimization of the regression model, when the operating speed was 1km/h, the rotation speed of the seed platter was 11.66r/min, and the vacuum degree was 5kPa, the eligibility index of seed selection was 87.1%, and the omission index was 8.8%, which met the requirements of single seed selection of garlic. The research result can provide a feasible reference for the mechanized seeding of hybrid garlic.