Abstract: In order to solve the problem that shearer dust is easy to pollute the pedestrian space due to the crosswise diffusion of airflow in fully mechanized coal face, this paper takes the actual field of the fully mechanized caving face of Yangchangwan Coal Mine in Ningxia as the research background, combined with the cooperation relationship between stope space and mining equipment space. Through the establishment of a CFD numerical calculation model, the relationship between the dust extraction air volume of the shearer air-borne dust collector and the air flow distribution in the stope is analyzed, and the effectiveness of the air-borne dust collector on the coal dust control of the coal shearer is demonstrated, which is a guide for the coal shearer to cut coal, and provide technical support for dust control. Numerical simulations show that as the air volume of the airborne dust collector increases, the wind speed in the area in front of the shearer shows a gradually increasing trend, and the cross-wind flow speed generally decreases; when the air volume of dust extraction gradually increases from 92 m3/min to 345 m3/min, the speed of the pedestrian side wind gradually decreases with the increase of the dust extraction air volume, the speed of the pedestrian side wind gradually decreases from 1.2 m/s to 0.8 m/s, and the wind speed decreases by 33.3%, indicating that the airborne dust collector can reduce the factor. The field measurement shows that when the air volume is 155 m3/min, the velocity of pedestrian side air flow is reduced by more than 23.1%, and the velocity of pedestrian side air flow is obviously reduced, the results show that the airborne dust remover can reduce the diffusion degree of the transverse dust-containing airflow which is blocked by the shearer.