The invention relates to a synthesizing method, in particular to a synthesizing method for ethyl difluoroacetate, and aims at solving the problems that an existing synthesizing method for the ethyl difluoroacetate is complex in technological process, low in safety and high in preparation cost. The synthesizing method comprises the steps that 1, a catalyst is prepared, wherein a tubular reactor is filled with Al2O3 powder with the certain particle size meshes, it is guaranteed that the height of the Al2O3 powder is in a heating area of the tubular furnace, the temperature is increased to 250 DEG C-300 DEG C under nitrogen protection and kept for 12 h, CHaFbClc gas is continuously and slowly introduced for a reaction, the reaction temperature is set at 250 DEG C-300 DEG C, and the reaction time is set for 12 h; 2, 1,1,2,2-tetrafluoroethyl ethylether is taken as raw materials for a reaction under the conditions of the certain temperature and the catalyst, and an intermediate does not need to be separated and is directly collected through condenser to be converted into ethyl ester. The method belongs to the field of chemical engineering.