Water body purification device for aquatic breeding

A water body purification device for aquatic breeding comprises an outer box body, a purification box body and a water inlet pipe, a connecting plate is arranged in the outer box body, electric telescopic rods are connected to the four corners of the upper side of the connecting plate and the inner wall of the upper side of the outer box body respectively, the upper side of the connecting plate is connected with a heavy metal capture agent liquid storage box, and the lower side of the connecting plate is connected with a liquid distribution pipe; a discharging end of the lower side of the heavy metal capturing agent liquid storage tank penetrates through the connecting plate to be connected with a liquid distribution pipe, the lower side of the liquid distribution pipe is uniformly connected with a plurality of groups of liquid conveying pipes, the lower ends of the liquid conveying pipes slidably penetrate into the purification box body and are connected with a hollow disc, and a plurality of groups of liqui