Disclosed is a spinning-type multistage gas distribution swirl-mixing aerator. A gas distribution mode of the swirl-mixing aerator is modified, the defect that the aeration performance is not high is overcome, and uniform distribution of bubbles in an aeration service area is achieved. Flow division on gas is achieved, so that the gas enters a multilayer spiral cutting area where multiple channels are connected and is cut into micro-bubbles. Some gas enters a rotating device, the device drives a gas distribution grating to rotate by means of reaction force, and uniform gas distribution is achieved; meanwhile, a gas outlet of the rotating device stirs stagnant water at the bottom end, and the aeration performance is improved.