Abstract: Aiming at the problem of gas drainage boreholes and water accumulation in pipelines restricting the drainage efficiency in high gas and outburst coal mine, this paper developed a dual-channel continuous drainage and slag discharge device, and innovatively designed a solid-liquid separation filter plate and a gas-liquid separation screen. The upper and lower ends are respectively equipped with double-channel bypass pipes and double drains, which can realize continuous gas extraction and large-flow drainage in the process of water discharge and slag discharge. A multi-factor evaluation method was constructed based on indicators such as water discharge-slagging effect, operational performance and economic cost, and a comprehensive evaluation and optimization of three common water dischargers and this device were carried out. Excellent performance, convenient operation, wide application range, low manufacturing and maintenance costs, etc. Iit is applied in the 10102 working face of Hongyan Coal Mine, and the influence factor of discontinuous drainage is proposed as the evaluation index of water drainage method affecting drainage. There is a negative correlation. The reduction in the concentration of gas extracted within 20 days of using this device is only 61% of that of the traditional manual water discharger.