Short-range nitrification-denitrification bioreactor

The utility model discloses a short-range nitrification-denitrification bioreactor, which is of an integrated device formed by a biological reaction zone, a recirculation zone and an air lift zone, wherein an aeration device and a dissolved oxygen probe are arranged in the biological reaction zone, and the recirculation zone comprises a sedimentation zone and a drainage pipe; and a partition plate is arranged between the biological reaction zone and the recirculation zone, and the air lift zone is positioned between the biological reaction zone and the recirculation zone.