Feed pellet machines can be divided into two types: flat die pellet machines and flat die pellet machines. The working principle of the flat die pellet machine is to use high pressure to compact the feed. Its feeding method is mechanical forced, and the pressure is limited by the mold. The ring die pellet machine uses a ring mold and a pressure roller. The material is pressed into cylindrical pellets in the mold hole. It has a long service life and uniform feeding, which is suitable for large farms.