In modern agriculture, organic fertilizer is increasingly widely used, which can not only improve soil structure, improve crop quality, but also promote the sustainable development of agriculture. In the manufacturing process of organic fertilizer, fertilizer granulator series equipment plays a crucial role. This paper will focus on four kinds of organic fertilizer granulator --Fertilizer Granules Compaction Machine,Flat-Die Pellet Machine,Rotary Drum Granulator and Disc Granulator , and discuss their significant advantages in the fertilizer granulation industry.