The invention discloses a method for preparing powdery selective catalytic reduction denitration catalyst by using a sol impregnation method, which is a method for preparing powdery SCR denitration catalyst by utilizing sol type meta-titanic acid as an impregnation carrier. The method comprises the following steps of: by taking the sol type meta-titanic acid as the carrier, carrying out first impregnation loading on the sol type meta-titanic acid and ammonium tungstate-oxalic acid solution; finishing secondary impregnation loading on a prepared composite powder and ammonium metavanadate-oxalic acid solution after procedures including calcining, grinding and screening; and finally, finishing a preparation process of the powdery SCR denitration catalyst through treatments including secondary calcining, secondary grinding and secondary screening. Compared with a traditional SCR denitration catalyst preparation technology, the method has the advantages of simple technology and low economic cost and is suitable for an integral production mode of a titanium dioxide preparation technology and an SCR denitration catalyst production technology. In addition, the catalyst prepared by the method has the advantages of large specific surface area, uniform and reasonable micro hole structure, favorable thermal stability, ideal catalytic conversion efficiency to Nox component in flue gas and the like.