An aeration apparatus, comprising: a gas-liquid mixing-circulating module, a gas supplying module, a controlling module and a cleaning unit, wherein the gas-liquid mixing-circulating module comprises: a first switch valve, connecting to a liquid outlet of a culture tank; a booster pump, connecting to the first switch valve; a micro-bubble producing device, having one end connecting to the booster pump and the other end connecting to a liquid inlet of the culture tank; a first proportional valve; a venturi tube, having a head, a tail and a branch, the other opening of the first proportional valve connecting to the head; and a second proportional valve, having an opening connecting to the tail, and the other opening connecting to the second tube, wherein, a fifth tube transfer gas to the venturi tube through the branch; wherein, the controlling module regulates the gas-liquid mixing-circulating module, the gas supplying module and the cleaning unit.