The present invention provides a bamboo growth factor extraction method and its hair restoring liquid, which is characterized in that the hair growth stimulating component is extracted from bamboo and bamboo leaves, and is composed of fast growth component of natural bamboo to provide the hair restoring effect. Since bamboos grow and develop very rapidly, the bamboo and bamboo leaf tip can be extracted with the component for stimulating hair growth factor. Through animal experiments and human trials on the component, it is found that the component can reduce hair loss, stimulate hair re-growth, and accelerate the speed of hair growth, and the effects are significant.