Abstract: Seed collection with a straight tube under negative pressure can often lead to seed loss in the sowing area. Subsequently, the sowing quality can also be confined to the airflow interference. In this study, the seed collection was proposed with the bent tube under negative pressure. The structural parameters of the seed collection were then optimized for the bent tube, in order to reduce the airflow disturbances for the sowing consistency. Firstly, a mechanical model was developed for the structural parameters of the seed collection with the bent tube. The key parameters were determined to ensure that the seeds were transported under relatively stable airflow during operation, such as the diameter of the seed suction tube, sowing angle, and the shape parameters of the bent tube. In turn, the seed loss was minimized, due to the airflow instability. Finally, the three-factor and three-level experiment was designed with the working speed, seed suction negative pressure, and diameter of the seed suction tube as the primary variables. The results indicated that the optimal combination of parameters was achieved in the pressure at the seed suction inlet of 1.0 kPa and a diameter of the seed suction tube of 21 mm when the corn plant spacing was 25 cm and the working speed of the seeding device was 13 km/h. The coefficient of variation was 8.12% for the sowing time difference. The sowing consistency was relatively high in this configuration. The uneven distribution of the seed was effectively reduced under airflow fluctuations. The comparative experiments were also conducted to further validate the superiority of the seed collection with the bent tube under negative pressure. The experimental results demonstrated that the coefficient of variation for the sowing time difference was reduced by more than 4.6 percentage points in the seed collection with the bent tube, compared with the straight tube, when the working speed ranged between 12 and 16 km/h. The temporal consistency of the sowing significantly enhanced the sowing uniformity and accuracy under high-speed conditions. Overall, the impact of the airflow on the seed loss was effectively reduced to enhance the seed consistency during sowing. The seed collection with the bent tube under negative pressure was also combined with the high-speed seed guiding device. This finding can provide some insights and theoretical foundations for the optimization of the sowing equipment. The seed collection with negative pressure can be adopted into future sowing operations. The operational efficiency can be improved for high-quality sowing, particularly for the high crop yields and stable growth. The shape and structure of the seed collection tube can play a crucial role in the seed loss and sowing quality. This work can greatly contribute to the growing body of knowledge in the agricultural machinery and equipment in modern farming practices. The optimal seed collection can be extended for a wide range of crops for more consistent and uniform sowing. Additionally, the seed collection and sowing devices can also be further optimized to meet the demands of food security and sustainable practices in modern agriculture.