The invention discloses a preparation method, of a plant pigment and a genome-combined key chain. Its characterized in that, include following step : plant flower pigment extraction, plant genome quick extraction, preparation key chain finished product. The method for extracting the plant pigment and the genome combination key chain and the preparation method of the plant pigment mainly comprises the following aspects : the method is simple, the time is short, and the yield is high; the color of the key chain is derived from the natural plant pigment, and the flower color is various, and the like. The content, the industrialization and the economic significance, the parent-child interactive game project, the industrialization and the economic significance of the utility model increase the technology content of the tourist attraction, increase the variety, enriches the market, and enables tourists to obtain happiness and sense in the process of traveling and touring the tourist attractions.