The invention relates to an oxidation ditch sewage disposal method including rotational flow spreading treatment, wherein the method includes steps of disposing sewage in a grit basin, an oxidation ditch, and a secondary sedimentation tank; backflowing at least a part of mud in the secondary sedimentation tank to a water inlet of the oxidization ditch; performing the rotational flow spreading treatment on the mud returned to the water inlet from the secondary sedimentation tank through a rotational flow spreader; intensifying the hydraulic shearing effect of the periphery of the active sludge by a speed gradient field in the rotational flow yard, and guaranteeing the high activity of zoogloea surface, removing refractory mesh impurities cpated on the surface of a flocculating body and improving the mass transfer effect from the interface of the flocculating body to the center activity zone by combining with water; meanwhile, the method pushes the sludge flow of the base layer of the oxidization ditch, thus the sludge at the aeration zone is suspended in the water body, the sludge deposition is avoided, and the sludge utilization rate is improved. Through rotational flow, the aged sludge floated for gathering the grease and air bubble is broken during the biochemical process, thereby optimizing e eluent water quality, preventing sludge expansion and improving the settling performance. The invention further relates to a device for realizing the method.