The invention provides a medicine for treating damp-heat foot swelling of a duckling. Every 100g of the medicine is prepared from 3g of rhizoma atractylodis, 2g of talc, 3g of cortex phellodendri, 1g of rhizoma acori graminei, 1g of radix achyranthis bidentatae, 15g of Chinese granesbill, 15g of herba aleuritopteris subvillosa, 6g of herba juncus bufonius, 30g of root or stem of delavay rockvine, 15g of Omei Mountain bambusa, 30g of herba monochoria vaginalis, 3g of root of ampelopsis japonica, 5g of radix scutellariae and 12g of flos chrysanthemi indici. When the rhizoma atractylodis, the talc, the cortex phellodendri and the rhizoma acori graminei are prepared, impurities are picked out, and the raw barks are scraped; when being used, the rhizoma atractylodis, the talc, the cortex phellodendri and the rhizoma acori graminei are smashed, or the raw barks are scraped, and then the rhizoma atractylodis, the talc, the cortex phellodendri and the rhizoma acori graminei are soaked in warm boiled water for a while, then sliced and dried in the air. The medicine can radically treat the symptom of damp-heat foot swelling of the duckling without causing side effects; through cooperation of the rhizoma atractylodis, the cortex phellodendri and the rhizoma acori graminei, blood circulation can be promoted, the metabolism is accelerated, the dead cells on the surface are removed, and the heat is cleared, the dampness is dried, the wind is dispelled and the toxin is removed; additionally, since the properties of clearing heat and removing toxicity of the herba monochoriae vaginalis, the root of ampelopsis japonica, the radix scutellariae and the flos chrysanthemi indici, the symptom of damp-heat foot swelling of the duckling is effectively treated.