Aiming at the problem that uneven vibration frequency, uneven amplitude adjustment and unreasonable structure of the seed dressing device, the seedlings had high weight loss rate and high damage rate. Breeding device for potato seeder seed metering device was designed. Through the kinematics and dynamics analysis of the cleaning operation process, the main factors affecting the seed cleaning effect were determined, and the structure of the seed cleaning device was designed. This plank can also reduce the horizontal velocity of potato seed to decrease the distance of potato drop into furrow. The eccentricity, the main driving wheel speed of the conveyor belt and the height of the seed layer were used as experimental factors. The field experiment was carried out with the re-broadcast rate and the missed-air rate as test indicators. The test results showed that the elastic-guided clean-up parts can effectively remove the seed potatoes between the spoons, and the vibration-cleaning device can effectively remove the excess seed potatoes in the spoon, which was significantly improved. When the eccentricity was 1.9mm, the main drive wheel speed of the conveyor belt was 40.61r/min, and the seed layer height was 33cm, the replay index was 3.04%, and the missed broadcast index was 2.01%. The index was better than standard of China. According to industry standards, the effect of seed cleaning was significantly improved. The device provided a theoretical reference for improving the design of the seeding device of the scoop potato planter.