Abstract: To overcome technical challenges of unpredictable seed placement and uncontrollable soil penetration during UAV seeding in flooded and intercropping fields, a low-pressure airflowjet precision seeding device capable of controlled soil penetration depth has been developed．Device centers on a closed-loop system comprising a dial-sieve single seed screening mechanism, photoelectric detection trigger, and solenoid valve instantaneous opening valve activation, enabling seed placement coordinated control, instantaneous ejection, and vertical soil penetration．A chained model relating chamber pressure, ejection velocity, and penetration depth was established, and channel losses were corrected using an efficiency coefficient（0.3 to 0.5）．Structurally, a three-point quick-release mechanism combined with a self-locking worm gear folding mechanism was adopted to balance vibration resistance and aerodynamic interference avoidance．Results have shown that at conditions of air chamber pressure of 1.5 kPa and effective air chamber volume of 3.93×10⁻⁶ m³, seed ejection velocity reached 4.8 to 5.4 m/s, device achieved a soil penetration success rate of ≥90% and a penetration depth of 1.5 cm．Compared to centrifugal and gravity-based seeding methods, low-pressure energy-driven vertical soil penetration and an integrated perception-execution closed-loop control have been achieved, offering a reproducible technical solution for precision seeding by UAV in wetland and intercropping fields．