The utility model discloses a top-combustion-type airheater with a function of uniformly distributed smoke. The airheater comprises a swirling burner on the upper part of the airheater, an arch crown combustion chamber on the middle part of the airheater, and a heat storage chamber on the lower part of the airheater. The airheater is characterized in that the top part of the heat storage chamber is provided with an airflow distribution cap which is in stepped concave-convex shape and composed of a plurality of horizontal sections and slope sections, and the amount, the size and the angle parameters of the horizontal sections and the slope sections can be adjusted by changing the building mode of checker bricks so as to change the shape of the distribution cap. Due to the structure, the distribution situations of the smoke and the airflow can be effectively improved, the structure is simple, the realization is easy, and the effect of the top-combustion-type airheater is obviously superior to a traditional heat storage chamber of a flat-roofed top-combustion-type airheater.