The cooling tower uses the counter current cooling principle to cool the particles with high temperature and high humidity, which avoids the sudden cooling phenomenon caused by the direct contact between cold air and hot material, thus preventing the surface cracking of particles. At the same time, due to the use of air closers and large air inlet area, the cooling effect is remarkable. The slide valve reciprocating discharge mechanism is adopted, which has stable and reliable movement, small residue, low energy consumption and low operation cost The product temperature after cooling is not higher than 3 ℃ - 5 ℃ of the room temperature. It is suitable for the cooling of granular materials.