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In order to solve the problem of poor high-speed sowing quality of mechanical soybean seeder, an independent part-filling soybean double-row brush high-speed precision seeder was designed, which increased the number of holes by using the double-row seed tray structure, and independently divided the filling to avoid the mutual disturbance of the population backlog, so as to realize the high-speed precision seeding operation. Through theoretical analysis, the influencing factors of seed filling and seeding performance were clarified, and the relevant parameters of the molding hole and diversion groove were determined. The results showed that when the soybean plant spacing was 8cm and the seed distributor operating speed was 9km/h, the optimal combination was the hole inclination angle of 54° and the diversion trough inclination angle of 39°, the pass index was 95.5%, the missing seeding index was 2.0%, and the plant spacing variation coefficient was 13.1%. The results of the comparative test showed that when the operating speed was 8~12km/h, the qualification index of the independent sub-filling seed dispenser was increased by more than 1.3 percentage points, the missed seeding index was reduced by more than 0.8 percentage points, and the plant spacing variation coefficient was reduced by more than 2 percentage points. The results of the agronomic adaptability test of narrow row dense planting showed that under the condition of operation speed of 8~12km/h, the qualification index of independent sub-filling seed discharger under narrow row dense planting agronomy was above 90.1%, the missed seeding index was no more than 4.6%, and the coefficient of variation of plant spacing was no more than 20.1%, and the agronomic adaptability of narrow row dense planting was high.