The invention discloses a method for recycling glyphosate mother solution, and belongs to the technical field of chemical engineering. The method comprises the following steps: producing glyphosate and glyphosate mother solution by a glycine method or an iminodiacetic acid method; concentrating the glyphosate mother solution; carrying out an oxidization treatment on the glyphosate mother solution concentrate; cooling and crystallizing the glyphosate mother solution oxidation solution, taking out the crystallized glyphosate mother solution oxidation solution and concentrating; concentrating the permeate to obtain a sodium chloride product, and reusing the distillate; adjusting the pH value of the concentrate to 3-4, and then carrying out a photocatalytic oxidation reaction; adjusting the pH value to obtain a disodium hydrogen phosphate product or a trisodium phosphate product. According to the method disclosed by the invention, the concentration treatment is carried out before the glyphosate mother solution is oxidized, thus reducing the content of chloride ions in the glyphosate mother solution, increasing the concentration of the reactant, and increasing the efficiency of the subsequent oxidization reaction; hydrogen peroxide photocatalytic oxidation is carried out on the concentrate, the reaction is thorough, the oxidability is better, the substances difficult to oxidize by oxygen-enriched wet oxidization can be oxidized, and the reaction conditions are moderate.