The invention discloses an inverted oily sewage filter. The filter comprises a filter tank, a backwashing water pump, a backwashing water inlet pipe, a filtered water drain pipe, an exhaust port, a control box, a sewage inlet pipe, a compressed air pipe, a support and an oil slick drain port, wherein the lower end of the filter tank is connected with the sewage inlet pipe, and a water distribution plate is arranged at the tail end of the sewage inlet pipe and located in the filter tank; the top of the filter tank is connected with the backwashing water inlet pipe and the filtered water drain pipe, and the oil slick drain port is connected and mounted at the bottom of the filter tank; the compressed air inlet pipe is also mounted at the lower end of the filter tank, and the exhaust port is formed in the upper end of the filter tank; a fixed pore plate, a filter material and a movable pore plate are mounted in the filter tank. According to the filter, water enters uniformly, the flow speed is stable, impact damage caused by water flow to the filter material is reduced, the contact time of sewage and the filter material is prolonged, the filter efficiency is improved, the filter precision is high, the backwashing efficiency is high, oil retention is prevented, and the filter occupies a small area and is convenient to use.