Abstract: In view of existing problems in construction of intelligent working face of coal mine in China, such as thin thickness of mining coal seam, large Platts coefficient of mining coal seam, main cutting track is memory cutting, and poor adaptability to complex geological conditions, a hierarchical design concept of intelligent mine was put forward combining with a wealth of experience and application requirements of site production of coal enterprises. Intelligent mine system was divided into four levels, namely perception control layer, communication layer, data layer and application layer. At the same time, the functions and construction contents of each level were defined, each level is independent and relies on each other. The key technologies of intelligent mine construction was discussed, it is pointed out that many key technologies, such as multi-source sensor system construction, underground complex condition information transmission, intelligent mine cloud platform development, safety production system construction, intelligent linkage control of mine equipment, intelligent mine emergency response and so on, are the foundation of intelligent mine construction. In particular, cloud platform development and safety production system construction are the core of intelligent mine construction. In view of the traditional concept, fund raising, talent team and technical problems, the corresponding countermeasures were put forward. It is suggested that the construction of intelligent mine should follow the construction idea of "overall consideration, clear priorities, module construction, step-by-step implementation, base demonstration", which provides a reference for the construction of intelligent mine.