In order to accurately grasp the characteristics of dust migration law in fully mechanized excavation face of Binchang mining area, taking the 4107 heading face of Wenjiapo Coal Mine as an example, based on the fluid-solid coupling theory, the numerical simulation software was used to analyze the change trend of air flow field in heading face, the dust migration law under different air volume and the dust deposition law of different particle sizes, and the field measurement comparison was carried out. The results show that the airflow scattered from both sides and above of the tunneling equipment will interact with each other in the rear of the tunneling equipment. The airflow will continue to circulate and supplement, and a strong eddy current area will be formed again, and the airflow field will gradually stabilize away from the head. When the air volume is 1 400 m3 / min, the ventilation and dust control effect is relatively good, and the dust mass concentration in the roadway is low. In the case of increasing local ventilation in the tunneling face, the ability of the space airflow to carry dust will be greatly enhanced, especially for small particle size dust particles. The dust particles with a particle size of 10 ~ 35μm show a trend of increasing with the wind speed, and the dust deposition quality decreases. The dust deposition quality of 50 ~ 75μm is almost not affected by the wind speed.