Plant hair dye composition as well as preparation method and application thereof

The invention relates to the technical field of daily chemicals, in particular to a plant hair dye composition as well as a preparation method and application thereof. The composition is prepared from the following raw material components of a Chinese gall extract, a heuchera micrantha extract, a hair care extract and ferrous ion salt, wherein the hair care extract is selected from one or more of okra, stems and leaves of abelmoschus manihot and leaves of hibiscus syriacus. The Chinese gall extract is prepared by performing water extraction on Chinese gall and passing through macroporous resin; the heuchera micrantha extract is prepared by performing water extraction on stems and leaves of heuchera micrantha; the hair care extract is prepared by extracting medicinal materials and removing impurities by using activated carbon, the purification process of the extract is simple, the quality of the extract is improved, and the prepared plant hair dye composition does not contain toxic substances, is high in safet