Provided is an optimized coal blending method for blast furnace blown lignite.The method comprises the steps that lignite of which the volatile content is larger than 35% and the length of flame returned in a long-tube pulverized coal explosive experiment is larger than 600 mm is uniformly mixed with anthracite to form mixed coal, wherein the mass ratio of the lignite to the anthracite is (20%-50%):(50%-80%), and the sum of masses of the lignite and the anthracite is 100%; the mixed coal is determined through a long-tube pulverized coal explosive determinator, and when the returned flame length of the determined mixed coal is smaller than 100 mm, the mixed coal is ground into powder in a grinder.According to the optimized coal blending method for the blast furnace blown lignite, the lignite which is high in volatile, high in explosiveness and low in cost is used for blending coal for blast furnace blowing.In the method, due to the fact that the explosiveness and calorific value of the mixed coal after the lignite is added and the combustibility of the mixed coal are all considered, lignite blowing of a blast furnace can be conducted safely and efficiently, and the fuel cost is reduced.