Abstract: The goal of precision coal mining is to realize low-loss,high-output,no accident,less damaged intelli-gent mining of coal resources in the whole process with minimal manpower. In addition to mining technology,mining equip- ment,sensory perception,Internet of Things,and automation and information technology,the key to realize precision coal mining is the four-dimensional space-based geological guarantee and the cloud computing technology of transparent geology. This paper comprehensively discusses the technical connotation and purpose of geological guarantee for precision coal mining. The core of geological guarantee for precision coal mining is to use advanced equipment and software to realize the precision,visualization and transparency of the whole mine geological body and hidden attributes before,during and after coal mining,and to predict and prevent geological disaster and hazard sources in advance,so as to ensure the smooth progress of precision mining from the geological level. With regard to geological guarantee technology,two scientific problems of geometric calculation of geological body and geological disaster prediction and forecast are expounded,and seven cloud computing technol-ogies of tectonic geology,coal seam geology,geomechan- ics,geological disturbance,gas geology,hydrogeology and transparent geology are extracted. At the same time,the re- search progress of these scientific problems and key technologies are also described. In order to play the central role of geological guarantee technology in precision coal mining,firstly,the paper gives solutions to difficult scientific problems and key technologies,such as the accurate modeling of structural geology,the intelligent prediction of coal seam and coal quality,the analysis of mining disturbance and failure,gas parameter inversion and gas disaster prediction,hydro- geological analysis and water disaster early warning,and the transparent processing of comprehensive geological attrib- utes. Secondly,the cloud computing architecture,main functions and application modes in precision coal mining of geo- logical guarantee software system and its application are discussed,and the feasibility of these technical solutions is demonstrated through some application cases. Finally,it is pointed out that as long as further breakthroughs are made in these technologies,such as triaxial absolute in-situ stress sensor,broadband micro-seismic sensor,wide-range wind speed sensor,advanced detection in water-rich area,condition monitoring of coal seam spontaneous combustion and on- line water quality test,a relatively complete geological guarantee can be provided for precision coal mining.