The invention discloses a cloth coloring agent. The cloth coloring agent is characterized by being prepared from the following raw materials in parts by weight: 6-10 parts of fatty acid sodium, 2-3 parts of 2-hydroxyethyl methacrylate, 6-9 parts of vinyl acetate, 3-5 parts of triglyceride, 1-2 parts of sodium persulfate, 2-3 parts of ethanol, 3-5 parts of polyoxyethylene amine, 15-19 parts of 2,2'-thiodiethanol, 15-19 parts of sodium carboxymethyl cellulose, 4-7 parts of amylase, 4-6 parts of an AES partner thickening agent, 70-82 parts of water, 2-3 parts of a leveling agent and 2-4 parts ofa color fixing agent. The dyed cloth is uniform in color, has no color difference, is bright in color and is hardly faded, usage time is longer than that of the traditional dye, and the service life of cloth is prolonged.