To provide a method for clarifying a green liquor in production of sulfate pulp in which dregs content in the clarified green liquor is suppressed to the minimum and clarity of the green liquor is improved and operation stabilization of caustification step of green liquor production process and later can be led.

The method for clarifying the green liquor in production of sulfate pulp comprises returning a part of insoluble impurities (hereinafter referred to as dregs) separated and removed from the green liquor in an amount of 0.001-1 mass/vol% (based on green liquor treating amount) to the green liquor, aggregating dregs contained in dispersed state in the green liquor and separating and removing the dregs.