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Aiming at the problems such as big loss of grain dropped from the cutting table due to the mechanical collision of angular fruit frying pods in the process of oilseed rape combine harvesting, a low-loss recovery device of air blowing grain from the cutting table was designed, and the key components of the pneumatic nozzle were also designed. In order to ensure reasonable airflow distribution and recovery effect, the nozzle structure shape was designed by adopting the duckbill structure, and the supporting design of the harvesting device was made to realize the smooth operation of low-loss harvesting on the cutting table. Based on Fluent, the internal flow field of the nozzle was simulated, and the two-factor full factorial simulation test was carried out with the nozzle opening angle and nozzle opening width as the test factors, and with the airflow exit velocity, airflow width and airflow intersection distance as the evaluation indexes. The test results showed that when the nozzle opening angle was 35°, the nozzle opening size was 3 mm, the exit velocity was 138 m/s, the airflow width was 1 926 mm, and the airflow intersection distance was 64 mm, the wind screen coverage effect was the best;the bench test was carried out with the nozzle angle, transverse distance, and kernel drop height as the test factors, and the recycling volume as the evaluation index, and the optimal combinations of the nozzle arrangement parameters in the cutting table were as follows: nozzle angle was 19.6°, lateral distance was 387 mm;field test results showed that the oilseed rape cutting table loss rate was 2.48%, compared with the traditional harvesting operations, it was down by 35.5%~50.4%, effectively reducing the cutting table loss, to meet the oilseed rape low-loss harvesting operation requirements.