A mugwort pill containing a 95% ethanol extract of wormwood having an inactivation power with respect to a novel swine-origin influenza virus and an avian influenza virus is disclosed. In more details, the conventional mugwort pill is prepared by a hot water extraction method and has 0.8% of crude fat component however the ethanol extract mugwort crude fat of the present invention is 11.6%, in particular the crude fat component is 14.5 times higher, and the novel swine-origin influenza virus (H1N1) can be inactivated 99.99%, and it has a good disinfection effect to an avian influenza virus (H9N2). When a mugwort pill containing a 95% ethanol extract of wormwood having an inactivation power with respect to a novel swine-origin influenza virus and an avian influenza virus is administrated to people or fowls, the people or fowls can have immunity with respect to a novel swine-origin influenza virus and an avian influenza virus.
