Preparation method of dimethyl carbonate

The invention relates to a preparation method of dimethyl carbonate, and mainly solves the problems of easy swelling and quick activity decline of resin in the prior art. According to a technical scheme, ethylene carbonate and methanol are adopted as the raw materials, under the conditions of a reaction temperature of 60-160DEG C, a methanol/ethylene carbonate mole ratio of 2-10, and a catalyst/ethylene carbonate weight ratio of 0.005-1, the raw materials and the catalyst contact for reaction so as to generate dimethyl carbonate; and the catalyst is strong alkali composite imidazolyl resin. The method well solves the problems, and can be used for the industrial production of dimethyl carbonate.