The shape of the drum cooler and the drum dryer is basically the same, the material is added from the feed head, the cold wind is entered from the discharge end, and the two counter current meets, making it down to a certain temperature. The machine is designed to reduce the pollution of the cold air and improve the working environment. Matching with dryer can greatly improve the cooling rate, reduce labor intensity, further remove some moisture and reduce the temperature of fertilizer granules. The rotary cooler can also be used for cooling other powdery and granular materials. The device has compact structure, high cooling efficiency, reliable performance and strong adaptability.