Abstract: Aiming at the need of area and advanced treatment of gas in ultra-long working face, analyzed the technical requirements of key drilling equipment for ultra-long directional drilling along coal seam, summarized and compared the performance characteristics of several typical key drilling equipment for ultra-long directional drilling along coal seam in domestic and abroad. According to the production requirement of ultra-long working face in Baode Coal Mine, optimized the drilling equipment and carried out the engineering practice in the second panel area of Baode Coal Mine. Three ultra-long directional boreholes with diameter of 120 mm and depth of more than 2000 m have been completed, among which the maximum borehole depth is 2570 m, creating a world record of the depth of directional boreholes along coal seam in coal mine. Combined with drilling process parameters and measurement data, analyzed the application effect and limitation of key equipment, and presented the prospect for further improving the capability of ultra-long directional drilling equipment along coal seam.