The invention relates to an improved blast furnace coal injection system. The improved blast furnace coal injection system comprises a coal injection tank A, a coal injection tank B, two coal injection pipelines, a mixer and a coal injection main pipeline. The improved blast furnace coal injection system is characterized in that an auxiliary blowing pipe A and an auxiliary blowing pipe B are mounted on the horizontal sections of the two coal injection pipelines correspondingly, wherein outlets of the auxiliary blowing pipe A and the auxiliary blowing pipe B are positioned in the coal injectionpipeline; the air outlet direction of the auxiliary blowing pipe A and the air outlet direction of the auxiliary blowing pipe B are the same as the movement direction of pulverized coal; a blowing pipe A and a blowing pipe B are mounted on the inclined sections of the two coal injection pipelines correspondingly; outlets of the blowing pipe A and the blowing pipe B are positioned in the coal injection pipelines and are each divided into two opposite branch outlets; and the blowing directions of the two branch outlets are the same as and opposite to the movement direction of the pulverized coal. By means of the improved blast furnace coal injection system, the phenomena that coal does not pass, and the pulverized coal deposits during tank pouring can be effectively eliminated, so that thetank pressure of the coal injection tanks is stable during tank pouring, the coal injection rate is stable, and normal production of a blast furnace is guaranteed.