Wet Type Twin screw extruder is very suitable for aquatic pet feed. The energy consumption of twin-screw is lower than that of single screw by kneading and rubbing each other. In this way, the material can be kneaded and ripened more fully, the overall ripening degree can reach more than 95%, the stability of the product in water can be maintained at more than 24h, and the surface finish and particle uniformity of the particles are also better. After the extruded feed is fully cooked, the animals will not only taste good, but also have high digestibility and easy to absorb nutrients.