Fish-plant symbiotic device

The utility model provides a fish-plant symbiosis device. The system comprises a culture pond, a filter bed and a plant water culture pond, the culture pond is connected with the filter bed so as to discharge the culture wastewater into the filter bed for filtering; wherein the filter bed is connected with the plant hydroponic pond so as to discharge filtered water into the plant hydroponic pond to cultivate plants, meanwhile, the plants are used for nitrifying microorganisms in the filtered water and absorbing the microorganisms, and the plant hydroponic pond is connected with the culture pond so as to discharge water treated by the plant hydroponic pond back to the culture pond to form a closed-loop system. According to the utility model, the water pump, the aerator, the fan and other auxiliary equipment are combined with the sensor to realize the functions of constant temperature control, dissolved oxygen detection and control, water level detection and control, PH value detection and control and the like.