Preparation method of 2, 2-dimethoxypropane

The invention relates to a preparation method of 2, 2-dimethoxypropane. The method comprises the steps of adding a catalyst after mixing methanol and acetone, and reacting under a certain condition to obtain a crude product of 2, 2-dimethoxypropane; then, carrying out extractive distillation and redistillation to obtain a finished product of 2, 2-dimethoxypropane. The preparation method is simple in process, low in energy consumption and high in safety; experimental data proves that the yield can be up to over 90%, the purity of 2, 2-dimethoxypropane can be up to over 99%, and the quality of 2, 2-dimethoxypropane can be effectively improved.