The invention discloses concentrated laundry detergent. The concentrated laundry detergent is prepared from the following components in percentage by mass: 80-90% of a surfactant compound and 10-20% of water, wherein the surfactant compound is prepared by compounding linear alkyl benzenesulfonic isopropyl amine salt and a nonionic surfactant in a proportion of (2 to 1) to (1 to 4). Concentration of the surfactant can reach 80-90%, a solubilizing aid does not need to be added, and the production cost is relatively low; and moreover, a dissolving process is free of a gel phenomenon, and dissolving is quick.