The invention discloses a closed type circulating water breeding method of hexagrammos otakii. The method includes the steps of selecting a breeding water source, establishing a breeding environment, controlling the breeding density and the breeding water temperature, adjusting the breeding water quality, adjusting and controlling breeding water oxygen dissolution, selecting and putting in breeding bait, managing breeding sub-ponds, and preventing and controlling breeding diseases. An oxygen and water mixer is added to the tail end of a water processing device, an oxygen dissolution probe and an emergency gas chamber are added in a breeding pond, and an ultraviolet lamp box is communicated between a biological pond and the oxygen and water mixer. The breeding environment is controllable, closed type circulating water processing facilities are complete, the continuous optimism of the breeding environment is ensured, the water temperature is controllable, the fluctuation of the breeding water temperature is avoided, matched feed is put in, bait waste is avoided, the bait coefficient is decreased, the breeding economic benefits are improved, fish separating operation is conducted at the right moment according to the breeding conditions, polarization is avoided, the yield is increased, the breeding cycle is shortened, the time to market can be controlled, and economic benefits are improved.