The invention relates to a method for preparing ethylene carbonate by using ethylene oxide and carbon dioxide. The method mainly solves the problems that the activity of the catalyst is low and the active ingredients are easily lost in the prior art. The ethylene oxide and the carbon dioxide are used as raw materials in the method; the reaction raw materials are in contact with a catalyst to generate the ethylene carbonate under the conditions that the reaction temperature is 50 to 200 DEG C, the reaction pressure is 0.1 to 10.0MPa and the mass ratio of the catalyst to the ethylene oxide is (0.001-1): 1; and the catalyst comprises the following components in part by weight: a) 0.1 to 40 parts of metal salt MYn, wherein M is selected from Ni, Zn, Fe or Cu, Y is selected from Cl, Br or I, and n is 2 or 3; and b) 60 to 99.9 parts of heteroatom-containing silicon dioxide carrier SiO2-X, wherein heteroatom X is N or S, and the weight content of the heteroatom is 0.1 to 13 percent of the weight of the catalyst. According to the technical scheme, the problems are well solved, and the method can be used for industrial production of preparing the ethylene carbonate by using the ethylene oxide and the carbon dioxide.