The invention relates to a preparation method for an efficient photocatalyst SrTiO3/Bi2WO6 and an application of the photocatalyst. The preparation method is used for solving the problems of low photocatalytic degradation efficiency in visible light, unstable catalyst, photoproduced electron and hole recombination, and the like. The preparation method for the catalyst comprises the following steps: adding NaOH into a mixed solution of TiCl4 and Sr(OH)2*8H2O under the condition of ultrasonic stirring, then heating an obtained precursor in a hydrothermal kettle, and washing and drying a product to obtain nano-sized SrTiO3; and dissolving SrTiO3 in a bismuth salt solution, mixing with a tungstate solution, heating in the hydrothermal kettle, and washing and drying a product to obtain a SrTiO3/Bi2WO6 photocatalytic material. The catalyst material prepared with the method is simple in production method, high in photocatalytic activity, stable in performance and low in price.