Abstract: Existing studies on the dust transport pattern in fully mechanized excavation faces mostly focus on simplified conditions or short roadways, with insufficient simulation research on long-distance, full-scale working faces containing complex equipment. Dust control is often limited to optimizing a single dust removal technology, lacking an integrated control scheme that combines source suppression and ventilation-based dust control. To address these problems, a full-scale geometric model of an excavation face in the Gongwusu Coal Mine was established to numerically simulate dust pollution and diffusion in underground fully mechanized excavation faces. A comprehensive dust removal system composed of a high-efficiency foam atomization dust suppression device and a new self-dividing wall-attached air duct was developed. The synergistic effect of source capture and ventilation control was employed to enhance dust removal efficiency. Numerical simulation results showed that the dust distribution was related to the airflow direction. Because a large amount of airflow passed through the dust-producing area, the dust-laden airflow moved toward the roadheader area, causing high dust concentration near the roadheader. Over time, high-concentration dust nearly diffused throughout the entire working face, and the average dust concentration at the end of the roadway reached 105.9 mg/m³. In the breathing zone, high dust concentrations formed on both sides of the walkway, seriously polluting the breathing environment of underground workers. Field application results showed that the total dust and respirable dust removal efficiencies of the comprehensive dust removal system were 86.6%-89.7% and 86.6%-88.3%, respectively, significantly reducing the dust concentration in the roadway excavation site and improving the working environment of long-distance fully mechanized excavation faces.