Abstract: During underground drilling construction, soft layering and mudstone can easily cause collapse of the borehole, leading to sudden gas outbursts, the suddenness and intensity of which are difficult to predict.Libi Coal Mine mainly relies on directional drilling and extraction for gas control, and the blowout holes that occur during drilling construction have significant sudden characteristics and a large amount of gas emission.In response to issues such as the suddenness of blowout holes, delayed personnel response, and failure to adjust negative pressure in a timely manner, Libi Coal Mine has developed a comprehensive anti-blowout system for strong outburst coal seam areas.This system has multiple innovations, such as: two directly connected pumping ports; anti-blowout box pressure relief buffer; double layer air-water separation; anti-blowout sealing device; strengthening the extraction of debris box; real time monitoring of gas at the orifice; dynamic adjustment of negative pressure at the orifice; drilling pipe one-way check valve anti-blowout; orifice collector device; gas blowout hole cushion airbag.An effect test was conducted in the underground drilling site.During the test, the system achieved high gas extraction capacity, good control of single coal and gas injection, and gas concentration in the drilling site and return airflow remained below 0.15%,greatly improving safety and achieving the goals of “zero gas exceeding” and “zero coal seam outburst”.