The invention relates to alkylphenol sulfonic polyoxyethylene ether succinate monoester sulfonate and the preparation method thereof, mainly aiming at solving the problems that current oil displacement agent containing surfactant is poor in oil displacement efficiency under high temperature with the existence of high salt and that the oil displacement agent contains alkali and causes damages to the stratum and the oil field and erodes the equipment and the pipes, which results in high production cost. The invention adopts alkylphenol sulfonic polyoxyethylene ether succinate monoester sulfonate with general molecular formula (I) to solve the problem; wherein M is alkali metal; R is alkyl from C1-C22; n is any integer from 1 and 20. The alkylphenol sulfonic polyoxyethylene ether succinate monoester sulfonate can be applied to the production of tertiary oil recovery in oil fields.