Formulation of the Exendin injection medicine containing stabilizing agent

The invention relates to Exendin that is extracted from lizard saliva. It is natural blood sugar reduction polypeptide substance. The invention also relates to a stable liquid formulation for Exendin, which is used to treat diabetes. It is especially related to a formulation that can improve Exendin stability distinctively, that can prolong liquid Exendin storage time, and is favorable for clinical extension.