In response to the problems of simple structure, poor air separation effect, and single air separation test object in tea air separation equipment, in order to improve the air separation effect and tea quality, a green tea air separation equipment was designed and tea air separation performance tests were conducted under different processes. Firstly, the basic structure and working principle of the tea air separation equipment were elaborated, and its key components were theoretically analyzed. The relevant design parameters of the air separation room, fan, transmission device, and material transfer device were determined. Then, based on fluid mechanics, the simulation of fluid in the air separation room was carried out, and the movement of particles in the air separation process was simulated by discrete element simulation. It was concluded that the streamline was stable when the fan speed was 6~6.5m/s, and the air separation effect was good. Finally, validation tests were conducted on the air separation performance of famous and high-quality green tea air separation equipment. Prototype performance tests and air separation effect tests were conducted to explore the impact of different operating frequencies and air separation sequences of fans on tea quality. The experimental results showed that the wind speed variation coefficients of the wind separation equipment were all less than 8%, and the optimal operating frequency of the fan frequency converter was 35Hz. The productivity per unit effective width was greater than 7kg/(cm·h),and the output per kilowatt hour was greater than 420kg/(kW·h). The fresh and killed leaves of tea was upgraded from B grade to A- grade and A grade, and the selection rate of tea was higher than 90%, indicating a significant improvement in the air selection effect. In each experimental group, the main tea outlet was overall superior to the other tea outlets, and the tea quality of the main tea outlet was the best in the green killing grading, with the highest sensory evaluation score for tea.