Integrated treatment device compatible with multi-stage AO and A2O

The invention relates to an integrated treatment device compatible with multistage AO and A2O. The integrated treatment device comprises a vertical reaction cylinder, an anaerobic zone is arranged at the bottom of the reaction cylinder, a comprehensive treatment zone is arranged above the anaerobic zone, the comprehensive treatment zone is of a sleeve layer structure, the inner layer is a settling zone, the outer layer comprises an anoxic zone and an aerobic zone, and the anoxic zone and the aerobic zone are located on the two sides of the settling zone respectively; the anoxic zone is provided with a plurality of first partition plates which equally divide the anoxic zone into a plurality of anoxic subareas, and the inner side or the outer side of each first partition plate is provided with a first water passing plate which can be opened and closed; the aerobic zone is provided with a plurality of second partition plates which equally divide the aerobic zone into a plurality of aerobic subareas, and the inne