The invention relates to a not-easy-to-fade dye formula, and belongs to the technical field of home textile printing and dyeing. The dye formula is prepared from the following components in parts by weight: 20-40 parts of a natural vegetable dye, 2-5 parts of sodium alkyl sulfate, 5-10 parts of sodium alkyl sulfate, 3-6 parts of sodium propionate, 5-8 parts of methyl acrylate, 1-3 parts of acrylic resin, 3-6 parts of glacial acetic acid, 2-5 parts of a fluorescent agent, 5-10 parts of an inorganic antibacterial agent, 0.5-2 parts of an anionic antistatic agent and 50-70 parts of deionized water. The acrylic resin is added to the dye formula, so that the cloth dyed and finished by the dye is not easy to fade; and furthermore, the dye formula contains the fluorescent agent, so that the cloth emits fluorescent light in a dark environment and the visual effect is good.