The invention discloses an integrated sewage treatment device. The device comprises a reaction tank, an MBR membrane group, a suction pump, a bubble release device, a gas dissolution system and a slag scraping device. The reaction tank is uniformly provided with multiple inclined plates along a length direction of the reaction tank. The reaction tank is divided into an aerobic zone above the inclined plates and an anaerobic zone below the inclined plates through the inclined plates. The bubble release device is arranged between the inclined plates and the MBR membrane group and is connected to the gas dissolution system. An ultraviolet lamp is arranged in a gas dissolution tank. The inner surface of the gas dissolution tank is provided with a titanium dioxide film. Ultraviolet can oxidize and decompose organic matters in the waste water under catalysis action of titanium dioxide. Through an air flotation technology, suspended solids, colloids, grease and other impurities in the waste water can be removed and oxygen is provided for the aerobic zone. The air flotation technology utilizes air flotation device effects of carrying out air flotation and washing on the MBR membrane group so that sludge deposition in the MBR membrane group is prevented. The MBR membrane group is uniformly distributed in the aerobic zone. The suction pump is connected to a water outlet of the MBR membrane group. The treated clear water is separated from the sewage, the product water quality is high and the effect is good.