Ecological treatment method of municipal sewage

The invention discloses an ecological treatment method of municipal sewage, which comprises the following steps: pretreating municipal sewage, filtering the municipal sewage, carrying out biological treatment on the municipal sewage, and sending the municipal sewage into an aeration tank to perform aeration reaction. In the municipal sewage pretreatment process, when the sewage passes through the grid, large impurities are removed; the sewage is enhanced by a water inlet pump station to enter an aeration-desilting-oil removal tank, thereby removing sand and floating oil in the sewage; and in the municipal sewage biological treatment process, return sludge and the filtered sewage are sufficiently mixed in a 4-6m-deep ecological treatment tank, the activated sludge adsorbs the pollutants within 3-5 minutes, and the phosphorus-accumulating bacterium releases phosphorus, thereby performing biological dephosphorization. The method can implement intermitted aeration; two adjacent branch air pipelines of the second aeration zone and third aeration zone are alternated every two days, and thus, the method has the characteristic of intermitted aeration; and the method can save the electric power, enhances the anaerobic dephosphorization effect, reduces the investment, and has the advantages of land saving and low operating cost.