Abstract: The drilling difficulties were analyzed for the soft coal seam, the solution was put forward which used high rotation speed spiral drilling technology to accomplish fast drilling and high efficient deslagging in soft coal seam, the structure and function characteristics were introduced about ZDY2800LG high rotation speed crawler drilling rig, which was developed for the soft coal seam drilling construction, and the industrial test of this drilling rig was elaborated in details, it used the matching plug type spiral drilling rod and high rotation speed drilling technology. The industrial test results verified that this packaged technology and equipment had significantly improved some key drilling indicators, such as the borehole forming rate, the maximum drilling depth, the average drilling depth, the monthly average drilling depth and the drilling efficiency, etc.