The invention discloses a method for treating easily-scaled salty wastewater. The method comprises the following steps: A, preliminarily clarifying and filtering the wastewater to remove suspended particles in the wastewater; B, carrying out ion grouping on the wastewater by a first electrodialyzer; and C, respectively independently carrying out secondary concentrating on first compartment produced water and third compartment produced water: conveying the first compartment produced water into a second concentrating device to obtain corresponding first freshwater and first concentrated water, conveying the first freshwater into a first compartment, adding pure water into the first compartment, conveying the third compartment produced water into a third concentrating device to obtain third freshwater and third concentrated water, conveying the third freshwater into the third compartment, and adding pure water, commonly used as third compartment feed water, into the third compartment. Themethod has the advantages of realization of easily scaled ions, prevention of scaling in an apparatus, low running cost, small volume of concentrated water, and large amount of reused freshwater.