The present invention relates to a method for extracting supercritical fluid of seaweed pigments and to a method for dyeing artificial wigs using the seaweed pigments thereof. The extraction method according to the present invention uses a supercritical fluid extraction device using carbon dioxide, thereby efficiently extracting the seaweed pigments comprising crude fat with high yield of 0.5-0.7% under a 120-150 bar condition. The method for dyeing the artificial wigs gives brown or dark green color having unique, natural, elegant, clear, and luxurious green color which has 25-40 of coordinate L^* value of Commission Internationale de lEclairageu 1976 (CIE 1976) L^*a^*b^*color system of dyed artificial wig, -2.5 to 4 of a^* value, 11 to 16 of b^* value, and 24 to 39 of color difference E^*_ab; has no concern regarding damages of the artificial wigs, and no side effects such as irritation when wearing the artificial wig; gives gloss and luster to the artificial wig; has enough short-term fastness without having inconvenience for use; and can bring back to original color by washing without bleaching using a bleaching agent when redyeing is required, thereby effectively preventing the artificial wigs from being desiccated.
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