The invention relates to the technical field of steel smelting and discloses a method for improving the air permeability of a sinter layer. The method includes the following steps that firstly, sintering raw materials are blended according to the specific proportion and put into a material mixing bin, water is added to a material mixing machine, mixing is conducted, then the mixed sintering raw materials are put into a sintering cup, the sinter layer is equally divided into two to four parts in the charging process, a layer of finished sintered ores is arranged when every equal division line is reached in the charging process, and finally ignition, ventilation and sintering are conducted on the prepared sintering raw materials and the sintering cup of the finished sintered ores. The method has the beneficial effects that in the processes of sintering and material distribution, the sinter layer is equally divided according to the thickness of the sinter layer, the finished sintered ores are evenly distributed in the middles on the equal division lines, consequently the situation that the air permeability becomes worse due to the fact that moisture of the mixed material gathers downwards along with sintering and ventilation in the sintering process can be improved, the speed of a sintering machine is increased, the usage coefficient is increased, and thus sintering efficiency and sintering quality are improved.