The invention provides a method for preparing difluoro acetylfluoride through nonmetal catalysis and a device. The method comprises the following steps: utilizing N-doped catalyst and 1,1,2,2-teflon ethyl ether as raw materials; reacting under the conditions of gas phase under reaction temperature at 160-240 DEG C and reaction airspeed at 50-200h-1, thereby generating difluoro acetylfluoride; introducing the generated difluoro acetylfluoride into ethanol solution and reacting, thereby further converting and generating difluoro ethyl acetate. According to the invention, the traditional catalyst, such as solid acid, is not used; a green environment-friendly nonmetal catalyst is supplied; the reaction selectivity is high; the use ratio of the raw material is high; the product purity is high; the industrial production is easy.