I. It granulates powdery materials directly at room temperature, high in granule intensity and free of pollution emission during production, etc. II. It is rational in equipment structure, stable in operation, low in running noise, convenient in operation & maintenance and long in service life. III. It is applicable for compound fertilizers, organic-inorganic compound fertilizers, mono-element nitrogen fertilizers, pharmaceuticals, chemical engineering, feedstuff & snow-melting agent granulation.