The invention relates to the technical field of sewage treatment equipment, in particular to an anoxic oxic (AO)<2> and sediment integrated multistage circulating reactor. The (AO)<2> and sediment integrated multistage circulating reactor comprises a shell, a sewage inlet pipe and a lifting device; an anoxic area, a first oxic area, a facultative area, a second oxic area and a sediment area whichare connected cyclically are isolated in the shell through partition plates, the anoxic area is located on the lower middle part of the shell, the first oxic area, the facultative area, the second oxic area and the sediment area are sequentially arranged on the upper part of the shell from inside to outside, sewage sequentially flows in the first oxic area, the facultative area, the second oxic area, the sediment area and the anoxic area in an unpowered mode through the water level difference, clear water in the sediment area overflows from the outer side of the upper part of the sediment area, and parts of sludge in the sediment area is discharged from a sludge discharging pipe; the sewage inlet pipe provides the sewage to the anoxic area and the facultative area according to the proportion; and the lifting device is used for lifting the sewage in the anoxic area to the first oxic area. The (AO)<2> and sediment integrated multistage circulating reactor is small in floor space and small in investment.