The invention discloses an air cooling tower for producing potassium nitrate. The air cooling tower comprises a cooling box, a material conveying pipe, a chimney fan, a capacity box, a collecting box,a first connecting pipe, a semiconductor refrigeration sheet, a first water pump, a rotating shaft, a first box cover, a second box cover, a fan, a motor, a water blocking layer, a second connectingpipe, a water inlet pipe, a second water pump, a feeding pipe, a power box and an infrared thermometer; the first box cover is connected with the top of the cooling box; a through hole is formed in one end of the first box cover; the power box is fixed at the other end of the first box cover; the second water pump is fixed inside the power box; the material conveying pipe is arranged inside the cooling box, one end of the material conveying pipe is connected with a first bottle cover through the through hole, the other end of the material conveying pipe penetrates trough the first bottle coverand the power box and is connected with a water pumping opening of the second water pump, and a water outlet of the second water pump is connected with the feeding pipe. The air cooling tower disclosed by the invention has the beneficial effects that the structure is simple, materials can be collected to the collecting box through S-shaped material conveying pipe after being cooled, and to-be-cooled materials can be fully cooled.