Abstract: The coal industry internet is an important engine to accelerate the high-quality development of the coal field. It can effectively drive the equipment intelligence and industry digitization in the energy field. The architecture of the coal industry internet is given. The research status and development direction of the coal industry internet technology are analyzed from five aspects: perception layer, transmission layer, empowerment platform, industrial APP, and information security. The perception layer has made progress in achieving ultra-low power consumption, precise perception, high reliability, and automatic energy capture. However, there are still problems such as single perception method and susceptibility to environmental factors. It cannot fully meet the needs of ubiquitous perception in mines. The intelligence level of the perception layer can be further improved through the development of new sensors, low-power and energy collection technologies, anti-electromagnetic interference technologies, and intelligent perception technologies. The existing Ethernet, 4G, WiFi and other technologies in the transmission layer cannot meet the high reliability, high bandwidth, and low latency transmission requirements of intelligent mines. 5G technology can meet the ubiquitous sensing requirements of the entire mine. However, there are still problems in underground applications such as limited maximum RF power and the incapability to reliably respond to underground emergency scenarios. Therefore, currently, 5G cannot fully replace traditional underground communication networks. The empowerment platform is the center and core of the coal industry internet to promote intelligence. It points out that big data is the key element of the empowerment platform. The mechanism model and diagnostic decision-making model of the coal industry are the soul of the empowerment platform. Digital twin technology can empower the production, decision-making, management and other links of the coal industry. Industrial APP can provide services for various links in the coal industry chain, and help the coal industry overcome challenges such as high risks, difficulty in process inheritance and innovation, and difficulty in industrial chain collaboration. However, the development and application of industrial APP in the coal industry are still immature. Information security is the guarantee for the intelligent construction of coal mines, and measures need to be taken from physical information security, network information security, system information security, data information security, and application information security to improve the level of security protection.