The invention relates to the medical technological industry, in particular to a cataplasm for treating infusion phlebitis. The cataplasm comprises an anti-sticking layer, a medicine paste body and a lining layer. The medicine paste body consists of medicines and a cataplasm matrix. The adopted machines are 5 to 10 parts of a rhubarb extract and 3 to 5 parts of borneol. The cataplasm matrix comprises the following ingredients in parts by weight: 4 to 6 parts of carbomer, 4 to 6 parts of sodium polyacrylate, 0.8 to 1.2 parts of gelatin, 5 to 8 parts of kaolin, 0.8 to 1.2 parts of PVPP (Polyvinylpyrrolidone), 0.07 to 0.13 parts of aluminum glycinate, 0.015 to 0.02 parts of tartaric acid, 4 to 6 parts of triethanolamine, 30 to 60 parts of glycerin and 40 to 60 parts of distilled water. According to the cataplasm for treating the infusion phlebitis, the rhubarb and the borneol are combined, so that the effects of relieving swelling and pain, cooling blood, eliminating carbuncle, purging heat and toxicity and removing stagnancy can be achieved. The symptom of the burning pain of a patient suffering from the phlebitis can be quickly and effectively relieved, and healing recovery is promoted. Moreover, the treatment cost is low, the cataplasm is convenient to use, frequent dressing change is avoided, and the operation burden of medical staff is alleviated.