The invention discloses a method for preparing vinyl acetate by using a micro-channel reactor. The method comprises the following steps: adding a catalyst to acetic acid, mixing until uniformity to obtain a suspension, introducing the suspension into the micro-channel reactor, introducing ethylene and oxygen into the micro-channel reactor together, controlling the temperature of the micro-channelreactor, performing a reaction, collecting the obtained product at the outlet of the micro-channel reactor through a condensing device to obtain a gas containing unreacted raw materials and a liquid containing the catalyst, separating the catalyst from the liquid containing the catalyst, distilling the liquid to obtain vinyl acetate, and introducing the gas containing the unreacted raw materials into the micro-channel reactor as a circulating gas. The micro-channel reactor is continuously operated, so the reaction time is shortened to dozens of seconds to several minutes from traditional several hours, thereby the reaction efficiency is remarkably improved. The method has the advantages of enhancement of the mass transfer and heat transfer performances, keeping of the reaction temperatureconstant, avoiding of the temperature runaway phenomenon, reduction of the generation of byproduct, and improvement of the safety of the reaction process.