The roller extrusion granulator can directly compress dry powder materials into particles at room temperature, especially for single raw materials such as rare earth, phlegm ammonia, ammonium sulfate, ammonium chloride, potassium chloride, phosphate fertilizer, monoammonium, salt, etc. It can also produce multi-element fertilizers based on carbon ammonium, urea, ammonium chloride, ammonium phosphate, potassium chloride, etc. It is also suitable for granulation of magnetic fertilizers and rare earth fertilizers, and does not require drying equipment. The resulting particles have high strength and can be formed in one go. There are multiple options for equipment specifications according to different yields