The invention discloses a traditional Chinese medicine composition for treating allergic purpura, which is prepared from the following raw materials in parts by weight: 18-20 parts of honeysuckle, 4-6 parts of radix rehmanniae recen, 1-3 parts of atractylodes macrocephala, 5-7 parts of lithospermum, 8-10 parts of periostracum cicadae, 2-4 parts of radix cyathulae, 6-8 parts of tree peony bark, 4-5 parts of mint leaf, 2-4 parts of grossy privet fruit, 6-8 parts of alisma, 4-5 parts of radix saposhnikoviae, 1-3 parts of carbonized sanguisorba root, 5-6 parts of lalang grass rhizome, 2-4 parts of prepared fleece-flower root, 1-3 parts of black sesame, 6-8 parts of herba violae, 2-4 parts of broomjute sida root and 1-3 parts of erose mussaenda leaf. The traditional Chinese medicine composition is prepared from natural medicines and has a definite curative effect and can effectively treat allergic purpura; the medicines cooperate to achieve the efficacies of nourishing blood, activating blood circulation, cooling blood, removing toxicity, adjusting immunity, permeating to remove ecchymosis, dispelling wind-evil and relieving itching. The traditional Chinese medicine composition can treat allergic purpura quickly and effectively, has no toxic or side effect and can avoid recurrence after curing.