The present invention relates to a transgenic plant with enhanced anthocyanin biosynthesis by the introduction of PtrMYB119 gene operably linked to a promoter, a method for preparing the transgenic plant, a method for producing anthocyanin from the transgenic plant, a composition for promoting anthocyanin biosynthesis comprising PtrMYB119 gene operably linked to a promoter, a kit for promoting anthocyanin biosynthesis comprising the composition, and a method for enhancing anthocyanin biosynthesis in a plant comprising introducing the composition into a plant for its expression. The use of the composition for enhancing anthocyanin biosynthesis provided in the present invention enables large-scale production of anthocyanins without any affect on the growth of the plant cell, which is a host, and thus the composition can be widely used for more effective production of anthocyanins.
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