The counterflow cooler adopts a unique swing-type discharge mechanism, which makes the discharge uniform, the particles are fully cooled, the whole machine runs smoothly, and the temperature of the cooled particles is not higher than room temperature +3~50. The channel is used to cool various feed pellets with a diameter of 1.5~8mm. The machine adopts the principle of counter-current cooling for drying. The high-temperature pellets are gradually dried by cold air in a short period of time. It is suitable for supporting pellet sets.