Catalyst for preparing unsaturated acid from unsaturated aldehyde by oxidization and preparation method of catalyst

The invention relates to a catalyst for preparing an unsaturated acid from an unsaturated aldehyde by oxidization and a preparation method of the catalyst. The invention mainly solves the problems of low reaction yield and low selectivity of unsaturated acid in the catalyst in the prior art. The technical scheme is as follows: at least one of SiO2, Al2O3 and TiO2 is selected as a carrier; and the catalyst contains the active component illustrated by the general formula Mo12VaCubXcYdZeOx, wherein X is selected from at least one of W, Cr and Nb, Y is selected from at least one of Fe, Bi, Sb, Ce, La, Zr and Th, and Z is selected from at least one of alkali metals or alkaline earth metals. By using the technical scheme of the invention, the problems are solved. The catalyst can be used for industrially producing acrylic acid or methacrylic acid from acrolein or methacrolein by oxidization.