The invention relates to an intelligent air flotation device for sewage treatment which is convenient for collecting scum, including a sewage tank, an air flotation machine, a filter plate, an annular plate and three moving mechanisms. The mechanism includes a floating block, a notch, an opening, a vertical bar and a limit assembly. The moving mechanism includes a translation assembly and a lifting assembly. The lifting assembly includes a first motor, a first drive shaft, a wire reel, and a suspension wire. The intelligent air flotation device, which is convenient for collecting scum, realizes through the closing mechanism that after the filter plate is separated from the liquid surface, the floating blocks block the openings and notches, so that the scum can stop on the filter plate and realize solid-liquid separation. When separating, the filter plate moves upward, so that the equipment can treat different sewage volumes. Not only that, the three moving mechanisms drive the filter plate to lift and move, and control the inclination of the filter plate, so that the scum can flow from the opening on the ring plate. It can be dropped anywhere, which is convenient for people to collect, thus improving the practicability of the device.