Compared with traditional mechanical seed metering, pneumatic seed collectors are beneficial for the configuration and efficiency improvement of seeders, and have become the main trend in the development of seed collectors both domestically and internationally. The pressurization pipe of the pneumatic collector of the seeder is an important component of the seed particle conveying process, and its structure directly affects the operational performance of the seeder. A combination of theoretical analysis and EDEM Fluent coupling was used to study the transport characteristics of seed flow in a pressurized pipe. After theoretical analysis, it was found that the main factors affecting seed particles included the structure of booster tube, the conveying airflow, and the material of device. Due to the external factors of device materials and conveying airflow, rapeseed seeds were mainly taken as an example to study the influence of pressure pipe structure on the motion state of seed particles. Coupling analysis showed that the commonly used V-shaped corrugated booster pipe had a good disturbance and dispersion effect on the seed flow. When the airflow speed was 16m/s, the mass of the outlet seed flow was relatively uniform when the diameter of the booster pipe was 30mm, the length was 100mm, the width was 10mm, and the depth was 2mm, with a coefficient of variation of 17.32%. The correctness of coupling parameters and model selection was verified through bench tests.