Abstract: In order to explore the influence of the number of dust collector exhaust pipes on the dust removal effect in fully mechanized excavation face, by using Solidworks software, a fully mechanized excavation face of Fengjiata Coal Mine was used as a prototype to establish a fully mechanized excavation face model and ANSYS Fluent numerical simulation software was used to simulate the influence of long-pressure and short-extraction ventilation on the dust removal effect. And through the improvement of the exhaust pipes, the dust removal effect of the arrangement of double and triple exhaust pipes was studied. The results show that in the tunneling roadway, the distribution law of dust mass concentration in the anti-gravity direction is descending, rising and descending, and as the distance from the working face is pushed farther, the trend of dust mass concentration decreasing gradually becomes obvious; dust removal with double exhaust pipes can significantly reduce the dust mass concentration on the return air side, and the high-concentration dust with an average mass concentration of 150 mg/m ³ can be controlled within 15 m of the heading face; on the basis of the double exhaust pipes, the installation position of the triple exhaust pipes is optimized, and the dust is successfully suppressed between the working face and the windlass, and the spread of dust in the tunnel space is prevented more effectively, the dust mass concentration in the working space meets the requirements and the dust removal effect is the best. This study is aimed at improving the exhaust pipes in the long-pressure and short-extraction ventilation dust removal system, and provides reference for dust removal technology in fully mechanized excavation face.