The invention discloses a plant nursing composition and a preparing method and application thereof. The plant nursing composition comprises an extract of radix gentianae, an extract of stems of maguey, an extract of chlorella and an extract of flowers of trifolium pratense. The plant composition contains the extract of radix gentianae, the extract of stems of maguey, the extract of chlorella and the extract of flowers of red clover, wherein the extract of radix gentianae helps to improve the biochemical function of the skin tissue, the extract of stems of maguey and the extract of flowers of red clover both have the anti-inflammatory effect, can protect hair follicles of the scalp, and improve the tenacity and elasticity of the hair; the extract of chlorella can promote detoxication and discharge of harmful substances in the environment, the mixture of the four plant extracts is adopted for replacing common scalp relieving agents, all the components play a synergistic effect, full playcan be given to the effects of all the components, the scalp is relieved, the situation that the scalp has pruritus and erythema cannot occur, the effect of scalp nursing is achieved, and thus the plant nursing composition can be widely applied to preparing various hair washing and caring products.