Double roller extrusion granulator is the key equipment for compound fertilizer granulation. It has the advantages of advanced technology, reasonable design, compact structure, novelty and utility, low energy consumption. It can support the corresponding equipment, forming a small production line to achieve a certain capacity of continuous, mechanized production. It adopts eugenics formula, and it can be produced at the room temperature without drying; the product is rolled and formed at one time, so the product quality is in line with the technical requirements of compound fertilizer. It is used for producing high, medium and low concentration of special compound fertilizer and also is an updated product for energy conservation and consumption reduction in compound fertilizer industry.