The automatic feeding system was designed in order to solve the problems of high cost and low automation. The system was composed of mechanical body and control system. The mechanical body mainly consisted of the feeding motor, feeding screw device, the stirring motor, mixing blade and the water supply system. The control system was composed of mobile control terminal, controller control panel and controller. The control part of the system can control the mechanical body of automatic fine feeding device based on liquid level sensor and photoelectric sensor, which can realize real-time control of the blanking motor, feeding motor and water pump and automation of ingredients, stirring, feeding, and washing buckets in process of pig feeding. Automatic feeding device included dry mixing motor, controller, profile, angle code, dry silo, mixing blades, water pump, hopper, discharge chute, mixed mixing blades, hybrid motor, feeding trough, spiral blade, arrange ushering bearing, carbon pipe, coupling and other parts. The results showed that the system was stable and reliable, and the mixing of dry and wet materials was realized. The drop of the feeding system was proportional to the operation time of the motor, and the determination coefficient of the relationship of positive proportional function was 0.9994 with motor at the speed of 150r/min in the test. The actual amount of falling material was the same as that of theoretical calculation, and its error was within 5%. The rotation speed of the feeding system was measured at 50r/min, 100r/min, 150r/min, 200r/min and 250r/min. The results showed that the quantity of the lower material reached the maximum at 200r/min, and the rate was 0.133t/h. Pig farms in Henan Province were taken as the test subject, totally 90 piglets were randomly divided into three groups of 30 piglets in the experiment. The average daily increment of piglets fed in the second and third weeks by the system was approximately twice of that of normal feeding.