Because of irregular shape and poor fluidity of ginseng seeds, the seeds need to be spewed before sowing. The spewed seeds are easy to be damaged, resulting in difficult seed filling and easy seed damage. A chain-spoon type precision seed-metering device for ginseng was designed. Through the analysis of the force and motion of seeds in the process of seed filling, the mechanism of tilting filling-seed improving the filling-seed performance was expounded. And through theoretical calculation, static and dynamic analysis of seed carried by seed’s spoon was done, and the single factor simulation test was conducted through the DEM-MBD coupling. The influence of different structural parameters and working parameters of seed-metering device on its working performance were analyzed and the structural parameters of chain-spoon type precision seed-metering device were ascertained. Based on DEM-MBD coupling simulation, the quadratic regression orthogonal rotation combination test was done, with the rotation rate of drive sprocket, filling-seed angle and seed’s height as the test indexes. Experimental results showed that the primary and secondary order of influencing conformity index was filling-seed angle, rotation rate of drive sprocket and seed’s height. When filling-seed angle was 71.73°, the rotation rate of drive sprocket was 79.10r/min and seed’s height was 84.28mm, filling-seed performance was the optimum, and the single grain rate was 95.68%, the refilling rate was 3.57%, and the missing filling rate was 0.75%. The bench test was conducted to testify the working performance of seed-metering device, which showed that the chain-spoon type precision seed-metering device for ginseng had better performance on filling-seed and can meet the requirements of non-forest ginseng sowing.