Abstract: Underground coal gangue intelligent dry separation was an effective technical means to realize green mining in coal mines. In order to deeply study the roadway design method of intelligent dry separation system, combined with the process flow of intelligent dry separation system, this paper summarized the design ideas, explored the determination method of gangue separation scale, analyzed the layout position of screening system, discussed the layout form of intelligent dry separation chamber, and studied the advantages, disadvantages and applicable conditions of intelligent dry separation system layout according to different types of main coal flow transfer and diversion points. On this basis, it was introduced that the engineering design case of double system at the lower entrance of coal bunker. The research shows that the roller screen arranged at the transfer point can avoid the transfer of large amount of end coal; The gangue sorting system is arranged at the lower opening of the coal bunker, which can deal with the instantaneous large volume of coal; The design mode of double system at the lower opening of coal bunker can provide reference for similar mines and has the value of popularization and application.