The invention discloses a foamed polyurethane intramode paint color modifier and a preparation method of the foamed polyurethane intramode paint color modifier. The foamed polyurethane intramode paint color modifier comprises the following ingredients in parts by mass: 10 to 20 parts of acrylic resin, 20 to 30 parts of solvents, 1 to 2 parts of anti-settling agents, 50 to 60 parts of fillings and 1 to 8 parts of pigments, wherein the acrylic resin is thermoplastic weatherability type acrylic resin of 50 percent dimethylbenzene solution, the solvents are arene S-100 solvents with the boiling point being 157 to 174 DEG C, the anti-settling agents are bentonite or gas-phase silicon dioxide, the fillings are quartz sand, calcium carbonate or barium sulfate, and the pigments are iron oxide red, iron oxide yellow or carbon black. The color modifier disclosed by the invention is suitable for color modification on the foamed polyurethane intramode paint surface, the material impurity effect of a stone plate after the color modifying is extremely similar to that of a natural stone plate, and the color and the luster are very distinct, natural and attractive. In addition, the color modifier disclosed by the invention has good performance of adhesive force, weather resistance, water resistance, durability and the like.