The invention provides a method of ionic liquid catalyze, continuously esterifying and rectifying synthesized ethyl acetate, comprising adding a definite proportion of acetic acid, ethanol and ionic liquid catalytic agent that is alpha-pyrrolidone bisulphate at the bottom of rectification column, setting an upper heat-preserving temperature, a lower heat-preserving temperature, a reactor temperature and a reflux ratio, heating up to generate refluxing liquid at the top of the column, then holding total reflux for 15min, adding the mixed liquor of ethanol and acetic acid to the esterification reactor continuously from a high-level tank at a definite ratio of alcohol and acid and a certain feed flow speed, opening reflux ratio for preparing ethyl acetate by continuous reaction and rectification; for keeping the stability of the system, refluxing partial coarse ester at a definite refluxing speed to the bottom of the reactor, and bringing out superfluous product by azeotropy. The method uses a high catalytic activity, high selectivity, low corrosive, acidic ionic liquid to take place the traditional strong corrosivity concentrated sulphuric acid as a catalytic agent for catalyzing and rectifying continuously the synthesized ethyl acetate, the method has the advantage of low cost, high utilance for raw material, and high yield of product and purity.