An aerobic granular sludge integrated sewage treating device is disclosed. The device comprises a water feeding pipe, aeration systems and a sludge discharging perforated pipe. The device also comprises a cylindrical tank body. The center of the cylindrical tank body is provided with a cone reaction drum. The periphery of the cone reaction drum is provided with cylindrical separation plates. The cone reaction drum is the first reaction chamber. The space between the cone reaction drum and the cylindrical separation plates is the second reaction chamber. The space between the cylindrical separation plates and the cylindrical tank body is the third reaction chamber. Each reaction chamber is provided with a plurality of layers of mesh plates which are arranged horizontally. The bottom of the cone reaction drum is provided with a water-gas mixing short pipe. The water-gas mixing short pipe is connected to a gas feeding pipe. The lower end of the water-gas mixing short pipe is provided with a frustum cone-like water feeding cavity. The outlet of the water feeing pipe is horizontally arranged, is in the frustum cone-like water feeding cavity, and is provided with a nozzle. The lower end of the cylindrical tank body is provided with a cone. The bottom of the cone is connected to the sludge discharging perforated pipe. The top edge of the inner wall of the cylindrical tank body is provided with a water discharging groove. The device has characteristics of simple configuration, construction convenience, small occupied space, convenient running, good quality of discharged water, low manufacturing cost, and low running cost.