The invention discloses an ecological circulating water cultivation method for improving the quality of fish. The ecological circulating water cultivation method comprises the following steps of: A, cleaning cultivation ponds by using calcined lime; B, pumping a water source obtained at the periphery to a reservoir by a water pump; C, after water quality meets the standard, injecting the water into the ponds; D, cultivating the fish; E, pumping the water to the reservoir by a submersible pump arranged in a final-stage pond; F, aerating the ponds in a mode of the aeration of micropores at the bottoms; G, monitoring physicochemical indexes of the water in the ponds every month; and H, leaking, evaporating moisture, and replenishing the water meeting the standard to the cultivation ponds. According to the ecological circulating water cultivation method, the reservoir, a canal wetland and the cultivation ponds take water flow as a carrier and are connected in series sequentially, namely the cultivation ponds are connected with the reservoir, the reservoir is connected with the canal wetland, and the canal wetland is connected with the cultivation ponds. The ecological circulating water cultivation method is simple, the cultivation yield and survival rate of the high-quality fish are improved, the quality of the fish is improved, the healthy cultivation of the fish and the zero discharge of cultivation waste water are implemented, and the environment of water areas is protected.