The invention relates to a catalyst for producing acrolein through direct oxidation of propylene, which is obtained by kneading, molding, drying and baking a cesium-containing catalyst (I) and a potassium-containing catalyst (II) which are mixed according to the mass percentages of between 10 and 50 percent of the catalyst (I) and to between 50 and 90 percent respectively. The catalysts (I) and (II) are as follows: the catalyst (I) comprises Moa, Wb, Bic, Fed, (Co and / or Ni)e, Sif, Csg, an Ox, while the catalyst (II) comprises Moa, Wb, Bic, Fed, (Co or / and Ni)e, Sif, Kg, and Ox, wherein the subscripts a, b, c, d, e, f, g, and x are atomic numbers of corresponding elements, and a is between 10 and 12, b is between 0 and 2, a plus b is equal to 12, c is between 0.5 and 2, d is between 0.5 and 2, e is between 3 and 6, f is between 1 and 3, g is between 0.01 and 0.3, and x is the summation of oxygen atomic numbers of oxides of the corresponding elements. The one-way conversion rate of the propylene for the catalyst for the propylene is more than or equal to 97 percent, and the one-way yield of the acrolein is more than or equal to 85 percent.