The invention relates to a preparation method and device of difluoroethanol. The preparation method of the difluoroethanol comprises the following steps: enabling a solvent to react with potassium hydroxide in a closed reaction kettle to generate an intermediate product; slowly introducing excess 2-chloro-1,1-difluoroethane into the reaction kettle; after reacting for a certain period of time, separating and purifying a product to obtain high-purity 2,2,-difluoroethanol. According to the preparation method provided by the invention, the difluoroethanol is prepared from 2-chloro-1,1-difluoroethane; the raw material, which is a byproduct of 1,-chloro-1,1-difluoroethane, is easily available and has low cost; the reaction conditions are mild, few byproducts are produced, and environmental pollution is avoided.