Abstract: In order to explore the movement laws of dust production in different time scales and space combination in fully mechanized coal mining face, ANSYS-FLUENT solver was used to carry out numerical simulation. The dust concentration distribution and trajectory in different space positions of fully mechanized coal mining face after cutting dust production 20 s, 40 s and 80 s were analyzed, and the accuracy of simulation results was verified by field measurement. The results show that high-speed air flow zones with maximum wind speeds of 3.1 and 2.7 m/s respectively occur in the front drum center to the downwind side 10.3 m, the frame front space from 2.1 m above the bottom plate to the roof, the sidewalk space from the center of the front drum to the downwind side 45.1 m, and the sidewalk space from 0.9 m above the bottom plate to the roof. With the increase of dust production from 20 s to 80 s, the positions of the front drum cutting dust flow from the shearer lane to the front of the shelf and the sidewalk are reduced from 4.1 m and 10.3 m to 2.1 m and 6.2 m respectively at the downwind side of the center, and the pollution area of the back drum cutting dust flow is gradually covered by 39.8 m at the downwind side of the center.