The invention discloses a reversible colored drawing restoring method and relates to the technical field of cultural relic restoration. The reversible colored drawing restoring method comprises the following steps: dust on the surface of a cultural relic building to be restored is cleaned; the surface of a colored drawing is covered by a transparent film; a solution of a film-forming material is evenly coated on the outer surface of the transparent film, and a transparent film layer is formed after the film-forming material solution is naturally dried; workers restore the colored drawing on the transparent film layer; and when problems occur in the process of colored drawing restoration, colored painting pigment on the transparent film layer is washed by water, and the colored drawing is restored again after cleaned and naturally dried. According to the reversible colored drawing restoring method, the transparent film layer is coated on the surface of a cultural relic to be restored, and colored drawing restoration is carried out on the surface of the film layer during restoration; if problems occur in the restoration process, the pigment on the transparent film layer can be washedout by water to carry out colored drawing restoration again; and reversible colored drawing restoration is achieved, and the cultural relic is prevented from being damaged.