This equipment is an improvement of the traditional pressure spray drying tower. Compared with the traditional pressure tower, the tower height of the upper exhaust tower is half lower. It can also be added with a fine powder converging device to return the fine powder under the cyclone to the tower and agglomerate with the liquid drops for granulation. The final product has good uniformity and large particle size. The process of later mixing can be saved by collecting materials at the bottom of the tower.