The invention discloses a novel sewage treatment device. The device comprises a treatment box and a pretreatment tank, the treatment box is located on one side of the pretreatment tank, the inside of the pretreatment tank is provided with a primary filter plate, a pipeline communicated with the inside of the pretreatment tank is disposed below the primary filter plate, and one end of the pipeline far from the pretreatment tank is communicated with the inside of the treatment box, a fixed block below the pipeline is fixed inside the treatment box, and an impeller main body is disposed above the top of the fixed block. According to the invention, through cooperative use of a water pump, the impeller main body, a connecting rod, a first bevel gear, a second bevel gear, a first gear, a second gear and other structures, the device can drive a C-shaped stirring rod, a curved stirring blade and stirring rods to stir sewage in the treatment box, is very energy-saving, and can treat sewage more fully after stirring, and reach a good treatment effect.