Circulating sewage purification tank for multilayer lemnaceae plants

The utility model provides a circulation type sewage purification pond for multilayer lemnaceae plants, which comprises a pond body, a moving mechanism is arranged in the pond body, a cleaning mechanism is arranged between the moving mechanism and two ends of the inner wall of the pond body, the cleaning mechanism is attached to the bottom of the inner wall of the pond body, a water pumping mechanism is arranged on one side of the pond body, and a water pump is arranged on the other side of the pond body. One end of the pool body is connected with a drainage pipe, one end of the drainage pipe is connected with a valve, a positive and negative motor is opened and drives a lead screw to rotate, so that a moving plate begins to move, and two limiting blocks slide in two sliding grooves; the bottom of the inner wall of the pool body is cleaned by rotating the two rotating rods, the moving plate drives the two brushes to move through the two rotating rods to wipe the bottom of the inner wall of the pool body, and