The discrete element method (DEM) simulation model of centrifugal metering device was established, and the simulation analysis was conducted on the motion processes of rapeseeds during the centrifugal metering device working. The law of rapeseeds movement was determined, and the relationships between rapeseeds weight inside the cone and critical speed, rotational speed and seeding quantity were also studied, respectively. The simulation results showed that with the increase of rapeseeds weight in the cone, the critical speed had a decreasing trend, and the seeding quantity had an increasing trend with the increase of rotational speed. The simulation results were consistent with the test results. It showed that using DEM to analyze the performance of the centrifugal metering device was feasible.