In order to produce marketable clownfish in large scale, facilities and techniques for indoor recirculating aquaculture of sea-water clownfish were developed. One group clownfish recirculating aquaculture system was composed of 10 round fiberglass tanks, 1 fibre glass tank for waster water purification and piping system. Physical filtering, biochemical filtering, and plastic algal plate filtering were adopted for circulating watzer purification. One group system could produce 5,000 marketable clownfish with size of 3.5 cm in total length in 3 months, and the survival rate was above 80%. More than 100,000 marketable clownfish have been produced from 2014 to 2015 in these systems. Compared with the conventional seawater edible fish recirculating aquaculture system, the indoor recirculating aquaculture system of clownfish reduced the protein separator or air flotation equipment and microfiltration machine, and supplement the plastic algal plate filtering system. The research showed that the indoor recirculating aquaculture system of clownfish was characterized by low construction cost, low operation energy consumption, easymanagement and maintenance , and stable water quality, which could basically achieve the goal of closed recirculating aquaculture, and was suitable for large-scale aquaculture production for clown fish and other sea coral reef ornamental fish.