The utility model discloses a fish and flower co-cultivating device. The device comprises a base, a fish cylinder body and a top box which are connected sequentially from bottom to top; the top box is provided with a trough plate to form a planting slot, a water pipe mounting hole and a water inlet are formed in the top box, the fish cylinder body is internally provided with a timing cycle jet pump which is connected with the water pipe mounting hole of the top box through a pumping pipe, and the timing cycle jet pump is connected with a power supply; the lower end of the fish cylinder is provided with an outlet on which a valve is arranged, and the base is internally provided with an LED (Light Emitting Diode) lamp and a connecting wire. The bottom of the co-cultivating device is provided with the LED lamp, and various flowers and grasses can be planted on the top box according to the personal preference, therefore the co-cultivating device is good in aesthetic property and high in ornamental value; meanwhile, the fishes and flowers are co-cultivated to beautify the environment, purify the air and improve living geomancy.