The invention relates to an animal pancreatic extract and a medicinal purpose of the animal pancreatic extract. In the invention, the animal pancreatic extract for preventing and curing diabetes is an active substance solution which is extracted from the fresh
pancreas of a young pig and has small molecular weight not more than 10000 Daltons, the extraction liquid is supernatant liquid, the pH value of which is 6.0-7.0, and each 1ml of the extraction liquid contains not less than 15mg of polypeptide and does not contain
insulin. The animal pancreatic extract of the invention is an active polypeptide substance with small molecular weight, which is obtained by taking the organ
pancreas which causes the diabetes as a target spot, selecting the animal
pancreas as a
raw material and using the modern technology for extracting. The animal pancreatic extract of the invention is suitable for preventing and curing various types of diabetes, curing severe diabetes, preventing levis diabetes fromworsening, preventing organ posttransplantation diabetes, reducing adverse reaction of anti-rejection drugs, reversing or delaying the occurrence and the development of the severe diabetes, and preventing various complications of diabetes.