Double roller granulator is the key equipment of compound fertilizer granulation, with advanced technology, reasonable design, compact, innovative and practical, low energy consumption, work with the corresponding equipment, consisting of small-scale production line, capable of forming a certain production capacity continuous , mechanized production. Using eugenic formulas, without drying,working at room temperature, one time rolling molding. compound fertilizer product quality in line with technical requirements, it is used in the production of various crops of high, medium and low concentration of compound fertilizer and special fertilizer industry energy saving replacements.