The invention provides a dual-channel rotation inertia coarse powder separator. The dual-channel rotation inertia coarse powder separator comprises an outer shell (2), an inner shell (8) and a gas and solid inlet pipe (1) which are all sequentially arranged in a sleeved manner from outside to inside; the inner shell (8) and the gas and solid inlet pipe (1) are each of a cylindrical structure with the upper end and the lower end open; an outer annular cavity is formed between the outer shell (2) and the inner shell (8); an inner annular cavity is formed between the inner shell (8) and the gas and solid inlet pipe (1); the lower portion of the outer shell (2) is connected with a powder returning pipe (9); and the upper portion of the outer shell (2) is connected with an outlet (3). According to the dual-channel rotation inertia coarse powder separator, the impacting separation is mainly changed into centrifugal separation, fluidizing air is added, the separation efficiency is higher, and the uniformity index is higher.