The invention discloses a preparation method of a surfactant for detergents and a detergent composition comprising the surfactant. The detergent composition is strong in dirt-removing power, low-foam and easy to rinse. The invention further discloses a special detergent composition for clean clothes; the detergent composition comprises the surfactant, alcohol alkoxylate, fatty alcohol-polyoxyethylene ether, a water-soluble growth substance, an anti-redeposition agent, a chelating agent and water; oil stains, sweat stains and other pollutants can be well removed when the detergent composition is used for washing the clean clothes, fibers cannot be damaged, overhigh dust content of the washed clean clothes cannot be caused, and the cleanness performance requirement is met.