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As the most advanced vegetable cultivation technology adopted all over the world, tray seedling is the key link of vegetables to increase crop yield and economic benefit. As the key to the whole production process, the precision of tray seedlings is directly related to the survival rate of seeds. Combining the small scale of the domestic vegetable tray seedling industry, low level of mechanization, and low profit of sowing equipment, a tray seedling precision seeder is proposed in this paper and ADAMS software is used to carry out dynamic analysis on the main stressed parts. The results showed possible problems in the design of this type of mechanism, and possible causes were analyzed, the structure of the precision planter was optimized based on the results, and the motion performance of the seeder was improved, which is of great significance for the realization of precision seeding in an automated assembly line.