The invention relates to a method for preparing vinyl acetate through catalytic reaction of dimethyl ether and synthesis gas. The method mainly comprises the following steps of obtaining a target object through the reaction of the dimethyl ether and the synthesis gas in the presence of the catalyst, wherein the catalyst mainly consists of a main catalyst, an assistant catalyst and iodomethane, by 100% of the total weight of the catalyst, the main catalyst accounts for 1 to 25 percent, the assistant catalyst accounts for 5 to 35 percent, and the iodomethane accounts for 40 to 75 percent; the main catalyst is elemental metal or metal compound, the elemental metal is one or the mixture of more than two of VIII metal in the periodic table of elements, the metal compound is halogenide and oxide of VIII metal in the periodic table of elements or one or more mixtures in oxysalt; the assistant catalyst is the substituted benzenesulfonic acid. By adopting the preparation method, the preparation procedure of the vinyl acetate is simplified, the preparation cost of the vinyl acetate is reduced, and the yield of the vinyl acetate can be increased by 10 to 30 percent.