The present invention discloses a treatment system for household refuse leachate. The treatment system comprises a material tank, a first-stage nanofiltration unit, a second-stage nanofiltration unit and an evaporator, wherein a feed end of the first-stage nanofiltration unit is connected to an outlet of the material tank; a clear liquid outlet and a concentrated liquid outlet of the first-stage nanofiltration unit are respectively connected with a liquid inlet of the second-stage nanofiltration unit and a feed port of the evaporator; a permeate outlet and a concentrated liquid outlet of the second-stage nanofiltration unit are respectively led to an external drainage pipe network and the feed end of the first-stage nanofiltration unit; a concentrate outlet of the evaporator is led to an organic fertilizer or solidification treatment unit; and an evaporated liquor outlet of the evaporator is led to a liquid outlet of the second-stage nanofiltration unit. When the treatment system is used, the pretreated leachate is subjected to first-stage nanofiltration and evaporation concentration at first until the content of organic matters in the concentrate is as high as 50%, and then is used as an organic fertilizer or is subjected to solidification treatment, the clear solution after the first-stage nanofiltration is subjected to second-stage nanofiltration treatment, the concentrated liquid after second-stage nanofiltration is subjected to first-stage nanofiltration for cycle treatment, and the permeate after the second-stage nanofiltration is directly discharged.