Lithium iron phosphate battery positive electrode material recovery method based on hydrothermal oxidation

The invention provides a hydrothermal oxidation-based lithium iron phosphate battery positive electrode material recovery method, which comprises: mixing a to-be-recovered lithium iron phosphate battery positive electrode material, an oxidizing agent and a weak acid solution, carrying out a hydrothermal oxidation reaction, and carrying out solid-liquid separation after the reaction is complete to obtain an iron phosphate solid product and a lithium-containing filtrate; then introducing the lithium-containing filtrate into the anode tank, and carrying out electrolytic reaction on the lithium-containing filtrate and the lithium hydroxide solution in the cathode tank; and adding an iron source and a phosphorus source into the electrolyzed catholyte, carrying out a hydrothermal synthesis reaction on the mixed solution, and carrying out solid-liquid separation after the reaction is completed to obtain the regenerated lithium iron phosphate material. According to the method, selective leaching of lithium is achieve