Abstract: Underground coal gangue intelligent dry separation was an effective technical means to realize green mining in coalmines. The author combining with the technological process of intelligent dry separation system, the design idea of underground intelligent dry separation system was proposed. On this basis, the corresponding analysis model is established according to the coal quality characteristics of selected raw coal, big data analysis is used to carry out digital identification of coal and gangue. Results shows that, reduce manpower and improve sales volume 2.25 million per month, provide new vitality and new kinetic energy for the high-quality development of mine production and management.