The invention belongs to the technical field of multistage treatment of sewage, and particularly relates to a multifunctional sewage purification device. The multifunctional sewage purification devicecomprises a stand and a cleaning barrel, wherein a water feeding pipe and a water discharging pipe are arranged on the cleaning barrel; a first valve is arranged on the water feeding pipe; a filter plate is arranged in the cleaning barrel; a piston cylinder is further fixedly arranged on the side wall of the cleaning barrel; a piece of oil filter cloth is arranged at a connection joint of the water discharging pipe and the cleaning barrel; a resistance wire is arranged in the oil filter cloth; a flexible oil discharging pipe is arranged below the oil filter cloth, and is connected with an oiltank; a second valve is arranged on the flexible oil discharging pipe; a first spring is connected between the oil tank and the stand; a first switch, a second switch and a third switch are arrangedon the stand; the oil tank is connected with the oil discharging pipe; a third valve is arranged on the oil discharging pipe; the inner wall of the water discharging pipe is connected with a turbine in a rotatable manner; one side of the turbine is connected with a swing rod in a rotatable manner; the other side of the turbine is connected with a cam. The multifunctional sewage purification devicecan perform multistage treatment on the sewage; furthermore, in a treatment process, blockage of the water feeding pipe by sediment is avoided; the multifunctional sewage purification device is mostly applied to treatment of the sewage.