The fish domestication at present is mainly operated manually in ocean ranching. Automatic fish domestication is an important technical measure to construct efficient operating mode. A new type of fish domestication equipment is designed according to the fish’s sensitivity to sound or light. It involves the function of timing control of sound and light as well as feed supply corresponding with the requirement. A wireless underwater video monitoring and positioning instrument is designed to supervise the domestication effect and realize positioning function. Taking Sparus macrocephalus fries as the research object, after 30 days of domestication, Sparus macrocephalus fries cluster obviously after starting the sound and light. Experiment results show the domestication effect is prominent and the whole system is designed reasonably. The sound, light, feed supply and energy system work regularly. The system reaches the design requirements which supplies an effective equipment for automatic fish domestication in ocean ranching.