The invention discloses application of argyreia aceta alkali in biological medicines. The whole herb of argyreia aceta has medicinal value, and argyreia aceta is widely distributed in many places of Guangxi, such as Guigang, Yulin, Fangcheng Gang and Wuming, and is used as a traditional Chinese medicine for treating acute and chronic bronchitis, tuberculosis, liver cirrhosis, nephritis edema, sores and furuncles, acute mastitis, skin eczema, traumatic bleeding and other symptoms. The argyreia aceta alkali is a chemical component separated from argyreia aceta. According to the invention, through the tests for the proliferation inhibition effect of the argyreia aceta alkali on human lung adenocarcinoma cell H2228, human bladder cancer cell T24, human hepatoma carcinoma cell SMMC-7721, humanbreast cancer cell MCF-7, human gastric carcinoma cell MGC-803 and human oral squamous cell carcinoma Tca8113, the argyreia aceta alkali is found to have an excellent inhibiting effect on human bladder cancer cell T24 and human oral squamous cell carcinoma Tca8113 and has no obvious inhibiting effect on other tested tumor cells, so that the argyreia aceta alkali can be used for preparing drugs fortreating bladder cancer or oral squamous cell carcinoma.