Fecha de publicación: 20/09/2022 Fuente: WIPO Wine The invention discloses a madder root liquid for external application and a preparation method thereof. The madder root liquid is prepared by soaking madder roots and aeschynomene indica roots in wine or extracting at low temperature according to the mass ratio of (3-6): 1. The prepared madder root liquid for external application has an obvious treatment effect on traumatic injuries and can obviously diminish swelling and diminish inflammation, the madder roots and the aeschynomene indica roots are combined for use, the effect is better, and an obvious synergistic interaction effect is achieved.