The invention discloses a large-area gradual change color spraying method. The large-area gradual change color spraying method comprises the following steps: (1) a pattern is drawn on the surface of afirst adhesive sticker film, specifically, the part needing to be colored is hollowed; a protective film of the first adhesive sticker film is removed, and the first adhesive sticker film is bonded on the surface of an object; and first special-color paint in gradual change colors is sprayed; (2) multiple geometric patterns are drawn on the surface of a second adhesive sticker film, and are arranged according to the following rule: the center points of the multiple geometric patterns are arranged in rows or lines; and in a requested linear gradual change direction, the circumcircle diametersof the adjacent geometric patterns are gradually increased or reduced; (3) the geometric patterns on the surface of the second adhesive sticker are hollowed; and (4) a protective film on the back surface of the second adhesive sticker film is removed, and the second adhesive sticker film is bonded on the surface of the object sprayed with the first special-color paint; second special-color paint is sprayed to the hollowed area of the second adhesive sticker film; and after the paint is dried, the second adhesive sticker film is removed. The large-area gradual change color spraying method not only can achieve stable paint spraying effect and quality, but also can effectively improve the efficiency.