Application of karanjin or Pongamia pinnata extract in anti-influenza virus drugs

The invention discloses an application of a Pongamia pinnata general flavone extract or karanjin in the preparation of influenza virus treatment and/or prevention drugs. The Pongamia pinnata general flavone extract is extracted from stem branches and/or leaves of Pongamia pinnata, contains 50-70wt% of general flavones, and also contains karanjin; the content of the general flavone is determined through an ultraviolet spectrophotometric method with karanjin as a reference substance; and the content of karanjin is 5-10wt%.