The invention relates to a foot bath drug for treating dampness-heat, which takes rhizoma atractylodis capable of eliminating dampness and dispelling wind as a monarch drug, takes cassia twig capable of dispelling cold and relieving exterior syndrome, warming meridians, freeing yang and transforming qi, takes Stephania tetrandra capable of dredging and regulating water passage, purging damp heat in lower energizer as well as angelica pubescens capable of dispelling wind, dispelling cold and relieving pain as ministerial drugs, takes fructus forsythia capable of clearing heat and detoxifying body, and reducing swelling and resolving mass as well as honeysuckle capable of dispelling heat and toxins as an adjuvant drug, and takes phellodendron capable of clearing away heat and drying dampness, purging fire and detoxifying body, and bringing down a fever as an envoy drug. Compatibility of a formula is reasonable, and the formula has the functions of clearing away heat and drying dampness as well as nourishing yin to decrease internal heat, and is the effective formula for adjusting moisture and heat physique. The foot bath drug mainly aims at damp-heat patients, and has efficacy for freeing channels and stimulating circulation of the blood, and clearing away heat and drying dampness. Because a foot is a second heart of a human body, reflection zones of internal organs can be distributed at the foot, the foot can be bathed by using the traditional Chinese medicines, so that reflection zones and acupoints on the foot can be stimulated, and a disease treatment purpose can be reached.