In order to decrease the cutting table loss rate of the rape combine harvester, a novel method to collect the falling rape seeds by airflow of positive pressure was proposed in this paper. To investigate the drifting characteristics of rape seed in the positive pressure airflow field, the movement process of the seeds was simulated by coupling of Fluent and EDEM. And then the results of the simulation were verified by a test bench. Experiments show that in an airflow field without stalks and with a certain initial height of the seeds, the collection amount of seeds falling from the position above nozzle increased first and then decreased with the ascending of the monomer vertical height, but descended with the increasing of the monomer longitudinal length. With the consistent structural parameters and exit conditions, in a certain range, the larger the airflow velocity value is, the better the collection effect is; outside of this range, the collection effect declined when the airflow velocity value continued to climb up. Under the condition that the collection monomer vertical height is 435 mm, the longitudinal length is 620 mm and the initial height of falling seeds is 700 mm, the optimum inlet airflow velocity of the simulation results is about 20 m/s, while the most preferably outlet airflow velocity of the bench test results is about 30 m/s. At this time, the corresponding collection rate of the seeds falling from the position above the nozzle is 97.30% and 92.10% respectively.