The invention discloses a synthetic method of vinyl ethylene carbonate. The synthetic method comprises the following steps: with 2-butene-1,4-diol as a raw material, uniformly stirring in a water solvent and adding mercury sulfate and concentrated sulfuric acid to have a reflux reaction for 2-4 hours; after the reaction basically ends, cooling reactant components to the temperature of 0-5 DEG C in an ice-water bath, regulating the pH of a reaction liquid to 6-7 by use of a 10% NaOH solution, afterwards performing a reduced pressure distillation process and collecting a product (at the temperature of 80-90 DEG C in a mercury column which is 15mm) to obtain a intermediate 1-butene-3,4-diol; dissolving the intermediate and triethylamine in a proper amount of a tetrahydrofuran solution, slowly dripping the triphosgene tetrahydrofuran solution in the ice-water bath, reacting for 3-5 hours at normal temperature; and removing the solvent and performing reduced pressure distillation to obtain the product. The method is simple in requirements on equipment, gentle in operating conditions, low in cost, high in purity and applicable to industrial production.