Preparing method of supported silver phosphate photocatalyst

The invention discloses a preparing method of a supported silver phosphate photocatalyst. The preparing method sequentially includes the following steps that zinc acetate, thioacetamide and hexadecyl trimethyl ammonium bromide are added into deionized water and stirred to be dissolved completely to obtain a mixed solution; the mixed solution is transferred into a hydrothermal kettle, placed into an oven and heated at the constant temperature of 105-140 DEG C, and the mixed solution is taken out of the hydrothermal kettle after reaction is finished; the product is naturally cooled to room temperature, supernate is discarded, and precipitate is collected, washed and dried at constant temperature to obtain zinc sulfide powder; a silver nitrate solution and a disodium hydrogen phosphate solution are mixed to form yellow green gelatinoids, and silver phosphate colloid is generated; the obtained zinc sulfide powder is added into the silver phosphate colloid, and the mixture is stirred, precipitated, separated, wash