Abstract: The content of solid impurities in the coalbed methane extracted from underground coal mine is high, which is easy to block the dry flame arrester, resulting in the reduction of the gas source pipeline transmission flux, and the frequent non-fault shutdown of the gas utilization device due to the maintenance of the flame arrester. In this study, a dry fire arresting structure with resistance triggering and automatic cleaning was developed to realize online automatic cleaning of the fire arresting device, and the automatic cleaning test was carried out to check the operation effect of the device. The results show that the device completely solves the problem of shutdown when the flame arrester of gas transmission pipeline is blocked and cleaned, improves the stability and reliability of the gas transmission and utilization end device, and greatly reduces the non-fault shutdown time of the coalbed methane utilization device. For the optimized DN500 type dry-type fire arresting device, the resistance is 670 Pa. After the simulated plugging of the test pulverized coal and automatic cleaning for 300 s, the resistance of the fire retardant device is reduced from 2 000 Pa to 700 Pa.