Full-automatic efficient multi-stage sewage purification device

The utility model discloses a full-automatic efficient multi-stage sewage purification device which comprises a rectangular water tank shell, a first cavity is arranged in the water tank shell, the upper end of the water tank shell is open, a water inlet is arranged on one side of the water tank shell, and a water outlet is arranged on one side of the water tank shell. Three partition plates are connected to the inner side wall of the water tank shell in a sliding mode, a collecting box is arranged on one side of the water tank shell, a driving mechanism used in cooperation with the collecting box is arranged on the collecting box, a lifting mechanism used in cooperation with the collecting box is arranged on the collecting box, and a pushing mechanism is arranged on one side of the water tank shell. The first U-shaped plate is brought to a proper height through the hydraulic rod, and dirt on the surface of the first U-shaped plate is cleaned through the push plate, so that the problems of time and labor wast