A method and system for treating the press-filtered liquid of city life garbage is disclosed. Said method includes such steps as physical filtering, adding sodium hydroxide and iron polysulfate, coagulating while depositing, adding the treated liquid to electrochemical reactor, turning on constant-current power supply, electrochemical treating, adding Fe2(SO4)3, introducing the water to efficient electrochemical plus Fenton reactor, turning on constant-current power supply, cyclic reaction while adding H2O2, and treating the water by electrochemical system and Fenton agent. |