The invention discloses a method and device for preparing methyl ethyl carbonate by using urea alcoholysis. The method comprises the following steps: taking urea, methanol and ethanol according to a molar ratio of 1: 0.2-10: 0.2-10, and adding a catalyst to a mixture; heating to 120 to 260 DEG C, reacting for 0.2 to 8h, lowering the reaction temperature to a room temperature, and obtaining methyl ethyl carbonate by separation. The preparation device mainly comprises devices such as a stripping tower, a reactor and the like. The method or preparing methyl ethyl carbonate by using urea alcoholysis has the advantages of no environmental pollution, cheap and easily available raw materials, and simple process; meanwhile, the catalyst for the method is simple to prepare and the raw materials are easy to obtain. The device enables the production of methyl ethyl carbonate to be industrialized.