Abstract: The Coal Industry Internet(CII)has the advantages of fast, safe, and green, which is an important support for the intelligent transformation of coal industry.China Coal Industry Internet is still in its infancy, with problems，such as unclear technical systems, high delays in information interaction, and difficulty in ensuring information security.In order to solve the above problems, we first analyze the importance of the Coal Industry Internet to the development of the coal industry and the national economy; then summarize the domestic and foreign research status of the Coal Industry Internet.According to the actual demand of smart mine construction in China,firstly，the author constructs the Coal Industry Internet general architecture which is divided into five layers:equipment perception layer, IaaS layer, PaaS layer, SaaS layer and cloud-side collaboration, to promote the formation of industrial production and service systems covering coal production, logistics, consumption and other fields; identifies key development areas,such as the Internet information security, technology system, information transmission, and ecological environment of the coal industry.Furthermore, the author points out the shortcomings of the domestic Coal Industry Internet in the above fields, summarizes and analyzes the direction of solving the above problems.Finally, the author puts forward detailed key technologies and the development concept of the Coal Industry Internet as following:the security protection of Coal Industry Internet, the digital mine basic information platform, the data middle platform, the mine central control system, and 5G+Coal Industry Internet, to promote the construction of intelligent coal mine and the high quality development of the coal industry.