The auto-feeder is a aquaculture device with advanced design concept and many patented technologies that being specialized developed for mass Farmers. It can be used in fish ponds reservoirs, lakes cages, indoor and outdoor standard fish ponds , shrimp ponds, crab ponds and different aquaculture water to feed the different specification pellet feed. It can spray the pellet feed in 360 degree without dead angle. The maximum radius of feeding is more than 8 meters. It is simple and convenient to install. The auto-feeder has lots of advantages such as simple in operation,uniformity in throwing,simulate artificial throw in timing and fixed quantity. It has great significance to scientific aquaculture, relieving the intense of labor, increasing utilization of feed.