The fish feed extruder is mainly suitable for processing aquatic feed particles such as catfish, grass carp, crucian carp, tilapia, ornamental fish, soft-shell turtle, bullfrog, etc. The types of fish feed have also gone through a process from raw to cooked, from shallow processing to deep processing, from the original crushed fish and shrimps for direct feeding, to the later stage of mature pellet feeding, to the current scientific feeding of nutritional ratios. At present, the feed types generally accepted by fishermen are: high-protein extruded feed pellets, with high protein content, fish grow fast, good absorption, low feed waste, and fish excretion does little damage to water quality, can be recycled, and develop ecological agriculture. . It is a powerful tool and means for sustainable fishery development.