Abstract: This paper designs a kind of automatic feeding system which can be applied to pet.The system considers the energy saving problem fully,its features are the use of pneumatic control and low power circuit,to achieve the system smart and automatically feed the function of the pet.This paper introduces the concrete realization of the system and the working principle of the structure and control circuit,system with microcontroller programming software realization of the hardware control and feed on considering sensor feedback control is more complicated and high cost.The test shows that the system achieves the requirement of expected design,can work intelligently and realizes the function of automatic feeding.