In this paper, the three-dimensional (3D) boundary model of fluted roll metering device is established. The three-dimensional ellipsoid seed model was established by using the method of four spheres combined with ellipsoid seed model. The performance and seeds behaviors are researched by using the self-developed 3D Discrete Element Method (DEM) software at microscopic and macroscopic levels. The performance of the fluted roll metering device and seed behavior were predicted, analyzing the flow, velocity, and trajectories of seeds at various rotational speeds. Comparative studies between simulation and experimental results reveal that at the exit of the seed metering device, the speed of the seeds is predominantly influenced by the rotational speed of the roller, while their motion trajectory is least affected by the roller. The mechanism of controlling the performance of groove roll metering device is further understood. The results show that the reliability and feasibility of measuring device for groove roll are analyzed by using 3D digital model.