The invention discloses an enol sulfonate compound and the preparation method thereof. The preparation method includes that an alkine compound shown in formula (I) and a sulfonic acid compound shown in formula (II) react in the presence of a MLYn transition metal catalyst in an inert organic solvent at 0-150 DEG C; and the reaction solution is subjected to a post-treatment to obtain the enol sulfonate compound shown in formula (III). The method has the advantages that the reaction conditions is mild; the operation is convenient; the product quality is good; the yield is high; the environment friendliness is ensured, the whole production process is substantially harmless; and the operators are safe; the reaction is in accordance with the atom economic principle, and has high utilization rate of the raw material. Since the enol sulfonate compound is an excellent raw material for preparing pharmaceuticals, agricultural chemicals and chemical products, the preparation method has wide industrial application prospect.