Allergic purpura is an immune complex-mediated vasculitis. Its common triggers are streptococcal, staphylococcal and viral infections, in addition to medications and food triggers. Proper dietary therapy can promote the healing of allergic purpura and also help to regulate the body to reduce the allergy rate. If the allergen is food, try to identify which food it is and give a strict diet of that food. Animal foods such as fish, shrimp, crab, egg, milk, and plant foods such as fava beans, pineapple, pollen, etc. may become allergens, and the incidence of allergic purpura caused by these foods can be 10-15%, which should be excluded one by one. High protein meals lean meat, animal liver, eggs, soy products and other high quality protein should be fully guaranteed. High vitamin foods, especially foods containing vitamin C have an important role in maintaining the normal function of blood vessels. Foods containing high vitamin C are mainly fresh vegetables, fruits, especially green leafy vegetables, green peppers, kiwi, citrus, fresh dates, prickly pears, etc. Mung bean sprouts are also a good source of vitamin C during the winter vegetable off-season. For patients with gastrointestinal symptoms, a liquid and semi-liquid diet can be given according to the condition; for patients with kidney damage, salt and water should be limited.