The invention relates to a liquid detergent dedicated for underwear, which is composed of the following components in percentage by mass: 8-12% of fatty alcohol-polyoxyethylene ether (3) sodium sulphate (70%), 8-12% of cocamidopropyl betaine (30%), 1-3% of coconut monoethanol amide, 2-4% of fatty alcohol-polyoxyethylene ether (EO=6-12), 0.5-2% of C3-4 polyalcohol, 0.1-0.5% of 4-Cl-3,5 xylenol and the balance water. The liquid detergent dedicated for underwear of the invention has strong detergency, thoroughly removes stubborn dirt, such as bloodstains, milk stains, urine stains, greasy dirt and the like, and has obvious inhibition and killing actions on staphylococcus aureus, streptococcus and tritirachium album; the pH value of the liquid detergent is 6-8, and thus the liquid detergent has neutral formula and moderate property, does not hurt clothes, has no stimulation on skins, is moderate, protects hands, and is suitable for cleaning intimates, such as baby clothes, diaper, underwear, thermal underwear and the like.