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A type 2BH-3 inter-row seeder for maize was designed to meet the agro-technical requirements of stubble mulching and row(ridge)-inter-row(furrow) tilling alternately, which can perform inter-row operations including fertilizing, seeding, covering and rolling at a time. In order to reduce the longitudinal length of the inter-row seeder, a multifunctional road wheel was designed, which can serve multiple functions such as land following, depth limit, transmission, soil covering, rolling and soil breaking. The discrete element simulation was conducted to compare the rolling effects of the two road wheels, one with a smooth inclined plane and the other with V-shaped ridges, by using EDEM software. The simulation results showed that the road wheel with V-shape ridges had higher ground pressure, making the porosity of soil decrease by 6.38%~6.93%. Field tests showed that the qualification rate of seed spacing was 89.8%, the miss seeding rate was 2.3%, the multiples rate was 7.9%, the average vertical distance between seed and fertilizer was 3.99cm, the coefficient of variation of instability of fertilizing between rows was 2.35% and the coefficient of variation of inconsistency was 1.62%.