Method for starting stable short-cut nitrification-endogenous denitrification nitrogen removal by preferentially strengthening phosphorus removal bacteria

The invention discloses a method for starting stable short-cut nitrification-endogenous denitrification nitrogen removal by preferentially strengthening phosphorus removal bacteria, which is characterized in that aiming at the treatment of low C/N (P) domestic sewage, a large number of high-activity phosphorus removal bacteria are preferentially cultured and enriched in an A/O process SBR (Sequencing Batch Reactor) by controlling cascade aeration in real time; and by utilizing the characteristics that the phosphorus removal bacteria quickly store an external carbon source COD (Chemical Oxygen Demand) of an anaerobic section and consume high aeration oxygen of an aerobic section, a low-organic-matter and low-DO (Dissolved Oxygen) environment is maintained in the reactor, AOB and DGAOs become dominant denitrification florae, and stable short-cut nitrification-endogenous denitrification nitrogen removal is realized. According to the method, the coexistence contradiction of phosphorus bacteria and denitrifying ba