The invention discloses a sewage treatment apparatus. The apparatus comprises a bottom plate, a filtering device is fixedly mounted at the left side of the top of the bottom plate, a controller is fixedly mounted at the left side of the filtering device, a conveying device is fixedly mounted at the right side of the filtering device, and a purification device is fixedly mounted at the right side of the top of the bottom plate. The mutual cooperation of the bottom plate, the filtering device, a filter box, a water inlet tube, a dirt discharging tube, a first mounting block, a second mounting block, a first filter plate, a second filter plate, a maintenance door, a handle, the controller, the conveying device, a support plate, a pump body, a conveying tube, the purification device, a purification tank, a motor, a stirring shaft, mixing blades, a water inlet tube, a water discharging tube, a control valve, a medicament tube, a sleeve and activated carbon makes the problems of low speed and high cost of sewage treatment, caused by easy pipeline obstruction and pipeline damages during discharging after filtration of the sewage due to existing sewage treatment apparatus not having the function of filtering large particles and impurities solved.