The invention relates to a method for improving the quality of a sulfonate detergent, which comprises the following steps: dissolving a sulfonate metal detergent into a solvent, adding 1 to 5 percent by weight of C1-5 low-grade fatty alkanol and 0.1 to 0.6 percent by weight of carboxylic acid in terms of 100 percent by weight of the sulfonate metal detergent, mixing the mixture evenly, then reacting the mixture for 1 to 3 hours at the temperature of between 60 and 90 DEG C, and obtaining the low-turbidity sulfonate metal detergent of which the turbidity is 150 to 200 JTU through distilling post treatment, wherein the solvent is fatty hydrocarbon or aromatic hydrocarbon of which the boiling point is less than 150 DEG C under atmospheric pressure. The method for improving the quality of the sulfonate detergent basically does not increase the cost, and has the advantages of simple process, convenience for adjusting and controlling, remarkable effect, strong applicability and excellent deterging property.