The invention provides a method for preparing baicalein-7-methyl ether. The baicalein-7-methyl ether is prepared by taking baicalin as a starting material through a one-pot and two-step method. A reagent used in the method is a reagent commonly used in a laboratory; furthermore, the reduction reaction in the key step can be carried out at room temperature, therefore, the method disclosed by the invention has the advantages of being low in cost, simple to react and easy to process, and the required materials are easily available; and a lot of baicalein-7-methyl ether can be obtained and used for researching and developing medicines.