Abstract: In order to solve the problems of dust pollution, poor lubrication of screw motor and overtemperature in the hole during air directional drilling in broken soft coal seams, an intelligent multifunctional dust removal system was developed for the first time, with a rated processing capacity of 32 m3/min orifice dust collector system to solve the problem of dust pollution during construction; the oil mist automatic lubrication system of air screw motor is developed, which realizes long-distance transmission of lubricating medium and continuous lubrication of screw motor, and ensures the service life of motor; an automatic emergency cooling system has been set up, which can automatically judge the abnormal temperature in the hole and take cooling measures independently to eliminate the risk of combustion of coal seam during drilling by real-time monitoring and calculation of the inlet air temperature and the return air temperature in the hole. Meanwhile, an air pressure and temperature monitoring and warning system is built to monitor the pressure air flow timely. The successful development of the multifunctional auxiliary system has solved the key problems of air directional drilling and laid a foundation for the promotion and application of the air directional drilling technology in broken soft coal seams and the “one hole and two elimination” gas control mode.