Sewage denitrification treatment device

The utility model provides a sewage denitrification treatment device which comprises a shell, a water inlet pipe is arranged on one side of the shell, and a water outlet pipe is arranged on the other side of the shell; a plurality of treatment assemblies are arranged in the shell, and a backflow channel is arranged between every two adjacent treatment assemblies; the water outlet pipe is connected with the water inlet pipe; the treatment assembly comprises a plurality of aerobic pools and a plurality of anoxic pools, the anoxic pools and the aerobic pools are sequentially arranged, and the anoxic pools are arranged on the side close to the water inlet pipe; a dispersion water inlet plate is arranged between the shell and the anoxic tank, a plurality of first dispersion holes which are uniformly distributed are formed in the dispersion water inlet plate, and second dispersion holes corresponding to the first dispersion holes are formed in the anoxic tank; a dispersing valve is arranged in the first dispersing