The invention relates to an anionic-nonionic amphoteric surfactant for oil displacement, wherein the surfactant is the phloroglucinol disulfonate of alkylphenol polyoxyethylene ether and lignin alcohol ether, the chemical general formula is represented by a formula 1 defined in the specification, R1 is C9-C16 branched chain or linear chain alkyl, x and y are the addition numbers of ethoxy groups,x is 8-20, y is 6-10, Lignin is lignin in English and represents the structure of lignin, and Y is an alkali metal. According to the present invention, with the anionic-nonionic amphoteric surfactant,the tension at the water-oil interface can be reduced, the molecular hydration ability of the surfactant can be improved through different nonionic hydrophilic groups, and the interaction between theion head group and the metal cation in the solution can be weakened.