Abstract: A special seeding-metering device with characteristics of twin vertical composite plate and clearing excrescent seeds by its gravitation was researched, which inherited and developed the simple construction, high reliability of traditional vertical plate, and took advantages of the low seed hurting rate and low working resistance of the one invented by the author. The device optimized the cell parameters of the formers, increased the speed ranges by twin vertical composite plate and effectively improved seed filling environment and seeding qualities. And the accessorial seed discharging lingua with favorable technical and working performances radically settled the inherent disfigurements of the traditional vertical plate seeding-metering device. It greatly improved the traditional vertical plate seeding-metering device with the outstanding characteristics of high performance and low price.