The invention relates to a novel aerobiont fluidized bed reactor and a technology thereof. The novel aerobiont fluidized bed reactor comprises a reactor tank, a water outlet, an exhaust valve, an air inlet, a water inlet, a sludge discharge pipe, swastika-shaped biological stuffing, an outer support, a flow meter, a water inlet pipe and a tilted plate settling pond. The technology for treating sewage by means of the novel aerobiont fluidized bed reactor comprises the steps that 1, sludge is acclimated; 2, the biological stuffing is added; 3, sludge is discharged after aeration is performed; 4, sewage is led in and then aeration is performed; 5, sludge is discharged; 6, the COD removal rate is calculated; 7, the fourth, fifth and sixth steps are repeatedly executed, and the amount of sewage to be treated and the sewage amount are increased gradually after the COD removal rate is higher than 50%; 8, the amount of the sewage to be treated reaches 25-50% of the effective volume of the reactor tank, and water outlet and backflow are started when the COD removal rate is higher than 80%; 9, the treated water is drained into the tilted plate settling pond through the water outlet.