Preparation method of iron phosphate with large-sheet structure

The invention discloses a preparation method of iron phosphate with a large-sheet structure, and relates to the technical field of iron phosphate preparation. The specific preparation method comprises the following steps: taking a monoammonium phosphate and diammonium phosphate mixed solution, and adding hydrogen peroxide to obtain a prepared phosphorus source; dissolving ferrous sulfate heptahydrate with water to obtain an iron source solution, and controlling the concentrations of a phosphorus source and an iron source; taking the prepared phosphorus source and iron source solution for neutralization reaction to obtain synthetic slurry; filtering the synthetic slurry, and washing a filter cake to obtain a wet-based filter cake; taking the wet-based filter cake, adding pure water to prepare slurry, supplementing phosphoric acid to enable nFe/P in the slurry to be 0.95-0.99, and adjusting the pH value of the slurry by using an acid regulator to obtain crystallized slurry; and heating, aging, filtering, washin