Rotary drum cooler is a new generation of high efficiency cooling machine developed by our staff for many years of compound fertilizer production experience. It is paired with the rotary drum dryer for cooling the fertilizer particles in a certain temperature and particle size during the production process of compound fertilizer. This rotary drum cooler can greatly improve the cooling speed, reduce labor intensity, improve the yield, further to remove part of water and reduces the fertilizer particle temperature. At the same time, it can also be used for the cooling of other powdery and granular materials. The equipment is with compact structure, high cooling efficiency, reliable performance and adaptable to any materials.