Sewage treatment system with ecological balance restoration function

According to the technical scheme, the sewage treatment system is characterized in that a first shell is fixedly installed at one end of an input pipe, a filtering mechanism is arranged in the first shell, the filtering mechanism comprises a filtering assembly and two switching assemblies, the filtering assembly is movably installed in the first shell, and the two switching assemblies are movably installed in the first shell; the two switching assemblies are fixedly installed in the first shell and located on the two sides of the filtering assembly, and the two switching assemblies are fixedly connected with the filtering assembly through the two second connecting strip plates. According to the device, the filtering mechanism is arranged, when outdoor domestic sewage enters the first shell from the input pipe, the outdoor domestic sewage is filtered by the filtering mechanism, and therefore algae in the outdoor domestic sewage are guided into the connecting pipe, and the function that the device has the funct