The invention discloses a method for preparing disodium hydrogen phosphate from a glyphosate mother liquor by using an ECO technology, and belongs to the field of chemical engineering production. Themethod comprises the following steps: (1) adjusting the pH value of the glyphosate mother liquor, and adding the adjusted mother liquor into an MVR evaporator; (2) completely transferring the obtainedmaterial into a crystallization kettle, and carrying out normal pressure crystallization; (3) carrying out solid-liquid separation after the material is crystallized; (4) carrying out normal pressuredegradation in a catalytic degradation tower; (5) carrying out heat exchange on the degraded wastewater to cool the wastewater to room temperature, transferring the cooled wastewater into an extraction tank, carrying out cooling and crystallization, pumping the obtained crystallized extract into a two-in-one filter press, and filtering the crystallized extract; and (6) washing the filtered solidwith water two times, discharging the washed solid, and packaging the solid for sale. The MVR evaporator is used to carry out concentration, so the purity of the product is ensured; and the electrocatalytic oxidation technology is used to catalytically degrade the glyphosate wastewater, so the disodium hydrogen phosphate can be obtained, the phosphorus resource and the salt resource can be recovered, and the cost is saved.