The invention belongs to the technical field of organosilicon compound synthesis, and particularly relates to a method for preparing dialkoxydiphenylsilane through a direct method. The method comprises the steps that under the protection of inert gas, metallic sodium is added into a mixed solution of tetraalkoxysilane and a dispersing agent, the mixed solution is heated to the temperature of 97 DEG C-113 DEG C, and a metallic sodium particle suspension solution is prepared; under the condition of 25 DEG C-45 DEG C, halogenated-benzene is dropwise added into the metallic sodium particle suspension solution, reacting is performed for 3-5 h and then stopped, and after reacting is finished, reduced-pressure rectification is performed on a mixture to obtain the dialkoxydiphenylsilane product. According to the method, the direct method is adopted, a one-pot combination reaction of chlorobenzene, metallic sodium and tetraalkoxysilane is achieved, and then the target product is obtained; the whole reaction is low in temperature, easy to operate, mild and controllable.