The invention relates to an N-acrylyl amino acid polymerizable emulsifier and a preparation method thereof. The N-acrylyl amino acid polymerizable emulsifier is characterized in that the N-acrylyl amino acid polymerizable emulsifier is shown in the formula I. The preparation method comprises the following steps: (1) synthesizing acryloyl chloride; (2) synthesizing N-acrylyl amino acid; and (3) synthesizing the polymerizable emulsifier. The prepared N-acrylyl amino acid polymerizable emulsifier belongs to a high-efficiency reactive type surface active agent, has a good emulsifying property and good polymerization stability, and can be used for emulsion polymerization, inverse emulsion polymerization, microemulsion polymerization and reversed-phase microemulsion polymerization.