The invention relates to a production process of a textile fiber color modifier. The textile fiber color modifier is prepared from the following raw materials in percentage by weight: 52%-68% of swelling agent, 10%-30% of emulsifying and dispersing agent, and 8%-20% of solvent, wherein the swelling agent is one or more of propylene glycol monomethyl ether, phenoxy-1-propanol, cyclohexanol methyl ether, N-normal-butyl-phthalimide, and N-isopropyl-phthalimide; the emulsifying and dispersing agent is one or more of styrylphenol polyoxyethylene ether sulfonate, polyoxyethylene castor oil, iso-tridecanol polyoxyethylene ether, fatty amine polyoxyethylene ether, polyoxyethylene (60) sorbitan monostearate (namely Tween-60), polyoxyethylene (80) sorbitan monostearate (namely Tween-80), and pesticide emulsifier No.600; and the solvent is one or more of water, ethanol, isopropyl alcohol, ethylene glycol, and ethylene glycol monobutyl ether. The production process comprises the following steps of adding all the materials into a reaction kettle and stirring the materials at 30 DEG C to 50 DEG C for 60 to 90 minutes, thereby obtaining the textile fiber color modifier. The textile fiber color modifier can be used for overcoming the dyeing defects of polyester and blended fabrics of the polyester in dyeing, and the dyed fabrics can meet environmental protection standards.