The invention discloses flame-retardant indigo blue pigment special for oil paint and relates to the technical field of chemical engineering paint preparation. The flame-retardant indigo blue pigment comprises 15-25 parts of aluminum hydroxide, 15-25 parts of magnesium hydroxide, 8-10 parts of antimony oxide, 3-5 parts of zinc borate, 6-8 parts of titanium dioxide, 8-10 parts of ammonium polyphosphate, 6-8 parts of white carbon black, 7-10 parts of triethanolamine, 6-8 parts of glycerinum, 8-10 parts of sodium stearate and 8-10 parts of indigo blue coloring matter. The flame-retardant indigo blue pigment has the advantages that the pigment and the flame-retardant materials are correspondingly fixed in advance, the fire resistance is achieved, meanwhile, the advantages of the obtained paint are ensured, and the pigment is uniform in texture, fireproof, flame-retardant, lasting in color, environmentally friendly, free of toxicity, efficient, high in market value and convenient to use and popularize.