<p>The damage of overburden caused by coal mining is the essence of surface subsidence and the damage of buildings. Under the concepts of green mining and solid waste utilization, the green development of coal-based energy is the current mainstream direction of development. The overburden grout injection technology is the best choice for protecting surface buildings and structures and achieving efficient utilization of coal resources. However, the tense relationship between industry and agriculture in mining areas is the main factor restricting the implementation of the overburden grout injection technology. Therefore, green coal mining technology of overburden grout injection with directional drilling (OGIDD) under buildings is proposed. By expounding the basic principles and technical steps of this method, a trajectory expansion model of directional drilling is established, and key technical parameters such as the optimal spacing and layout of directional drilling are determined. The design of the directional drilling structure based on the experience of traditional overburden grout injection drilling is optimized. Engineering applications indicates that the maximum surface subsidence is 34&#xa0;mm, and there are no obvious changes in buildings and structures, all of which are within the range of Class I damage. 0.52 Mt of coal resources under pressure have been liberated. This not only alleviates the tense relationship between industry and agriculture, but also achieves the dual goals of green coal mining and building protection, promoting the safe, green and sustainable development of coal enterprises.</p>