Abstract: In order to have a detailed understanding of the dust movement and distribution law of regional dust sources in fully mechanized working face with large mining height, taking 12511 fully mechanized working face of Bulianta Coal Mine as the research object, by using fluid dynamics CFD software, numerical simulation of dust movement and distribution in fully mechanized working face with large mining height of 8 m was carried out. The results show that the dust generated by caving coal seam diffuses to the rear of the shearer under the action of wind current, the highest point of high concentration dust mass movement is up to 5 m, and the dust concentration decreases gradually along the roadway. High concentration dust clusters are mainly concentrated in the front and rear of the shearer for 10 m and on the side of the coal block plate of the floor, with the highest dust mass concentration up to 3 500 mg/m³. In order to effectively reduce the dust concentration in the working face and prevent the pollution of underground working environment, it is proposed to install airborne dust collector in fully mechanized working face of large mining height to control the dust source to disperse to the pedestrian side, to achieve the purpose of purifying the workplace. By studying the influence of the location of the dust collector’s suction outlet and the air volume treatment on the dust movement and distribution law and dust removal effect in the working face, the fitting combination of suction port position and air volume with the optimal dust removal efficiency are obtained, and the maximum dust removal efficiency can reach 99.9%.