A method for applying Bayan Obo ore ultra-fine iron powder in sintering is a using method in sintering before iron making and belongs to the technical field of ferrous metallurgy sintering. The method for applying the Bayan Obo ore ultra-fine iron powder in sintering is characterized by comprising the steps of evenly mixing and pelletizing Bayan Obo ore main ore concentrate 16%-31%, Bayan Obo oreultra-fine iron ore concentrate 17%-31%, Mongolia ore powder 8.0%-9.0%, limestone 4.9%-5.1%, dolomite 2.4%-2.6%, unslaked lime 2.1%, coke powder 4.4%-4.5% and returned ores 30%, then performing sintering in a sinter pot and supplying sintered finished ores for a blast furnace, wherein the alkalinity of the sintered ores is controlled in a range of 1.90-2.05, and MgO is controlled in a range of 1.9%-2.1%. The Bayan Obo ore ultra-fine iron powder is added into sintering mixed materials, thereby improving air permeability and the yield of the sintered ores. In addition, solid burn-up is reduced remarkably, and the process is simple.