The invention discloses application of 
ciclopirox olamine in preparing a 
medicine for preventing or treating influenza 
virus infection. According to the application, firstly, the 
toxicity of 
ciclopirox olamine to MDCK (madin-darby 
canine kidney) cells is detected, and results indicate that maximum non-cytotoxic concentration of the 
ciclopirox olamine is 50.0 mu M; secondly, the anti-
virus activity of the ciclopirox olamine is detected in a complete non-cytotoxic concentration range, and results indicate that the small molecular compound has a remarkable anti-
virus activity, and the anti-virus effect shows a 
dose dependent effect; finally, the anti-virus activity of the ciclopirox olamine to different types and sub-type influenza viruses is detected, and results indicate that ciclopirox olamine can be used for inhibiting replication of all detected influenza virus strains in a 
dose dependent manner, and the anti-influenza virus activity of the ciclopirox olamine has 
broad spectrum. Therefore, the ciclopirox olamine is a novel broad-spectrum anti-influenza virus 
medicine, and can be used for preparing the 
medicine for preventing or treating influenza virus infection.