Coal mine geological guarantee technology is the key path to achieve accurate and green coal mining. In view of the requirements of intelligent mining and geological guarantee, the main problems faced by the geological guarantee of the mining face were analyzed, mainly including the weak basic theoretical research, insufficient geological exploration accuracy, modeling accuracy unable to meet the engineering application, difficulties in model dynamic updating, and lack of optimal decision-making means for global path of intelligent mining based on spatio-temporal evolution. According to the faced difficulties and technical status, the author explored and practiced the geological guarantee technology of intelligent mining in Yan’an Huangling No.1 Coal Mine and Yujialiang Coal Mine in Shaanxi. Taking the intelligent mining of 810 fully mechanized working face as the target, the integrated detection, data fusion and other technologies were adopted in Huangling No.1 Coal Mine to build a static geological model of the working face. Meanwhile, the geological radar and inertial navigation technology were used to dynamically modify the geological model of the working face. Besides, the key cutting curve of the shearer was obtained through “CT slice” of the high-precision geological model of the “transparent working face”. Thus, a coupling, coordination and linkage control mode was formed with the mining technology and equipment, to realize the planned cutting based on 3D space perception and intelligent data analysis, and further to promote the realization of intelligent unmanned mining in 810 fully mechanized mining face of Huangling No.1 Coal Mine. In terms of Yujialiang Coal Mine, it was proposed to build an unmanned mining mode of intelligent autonomous coal cutting face based on spatio-temporal data model, build a multi-attribute geological database of intelligent mining face by integrating the multi-source heterogeneous geological data, establish a high-precision spatio-temporal geological model of 43101 working face based on absolute coordinates, and visualize the 3D geological model based on the temporal geographic information system platform (4DGIS) to realize the arbitrary cutting of geological model. Then, dynamic correction was carried out with reference to the data of coal thickness, coal seam roof and floor, and coal-rock interface obtained by the geological radar while mining, so as to realize the automatic cutting of the shearer based on the high-precision geological model. Conclusively, a useful exploration of the difficulties faced was made based on two cases, with summary and prospect provided finally, thereby pointing out the technical direction for the high-quality development of enterprises.