The invention discloses a treatment process for deferrization purification of sodium citrate mother liquor. The process includes: adding sodium dimethyl dithiocarbamate which is a food-grade deferrization agent; performing precision filtration, high-temperature laminar flow, activated carbon decoloration and cation exchange to remove readily carbonizable substances including high-content iron ions, few protein colloids, organic impurities and the like in the sodium citrate mother liquor. The treatment process is simple and low in production cost, and quality of later-stage sodium citrate is greatly improved.