The invention discloses a method for treating a landfill leachate concentrated liquid. The method mainly comprises the following steps: feeding the landfill leachate concentrated liquid into a material separation membrane device to remove organic matters such as humic acid in the landfill leachate concentrated liquid, carrying out evaporative concentration treatment on a membrane-permeable liquid, namely, a landfill leachate concentrated liquid which penetrates through the material separation membrane to obtain evaporated residue, evaporated condensed water and exhausted condensed water, wherein the recovered organic matters such as humic acid are treated and backwards sprayed into an incinerator or are used for producing such products as humic fertilizers from humic acid as a raw material; a first evaporation concentrated product, namely, evaporated residue is backwards sprayed into the incinerator or is cured by virtue of asphalt and filled; and second evaporation concentrated products, namely, evaporated condensed water and exhausted condensed water are discharged with standard level or used as reuse water. By the method, zero-emission treatment of the landfill leachate concentrated liquid is achieved; and compared with the existing method for treating the landfill leachate concentrated liquid, the method has the advantages of stability in operation, high treatment efficiency, low operating cost, easiness in management, no secondary pollution and the like.