The instant disclosure provides a method for manufacturing composite film. The method includes the following steps. A bacterial cellulose film having a plurality of pores is immersed in a solution comprising a flavonoid compound and a polyol. A heat treatment is performed to the bacterial cellulose film immersed in the solution so that the flavonoid compound enters the pores of the bacterial cellulose film.本發明提供一種複合膜的製造方法,包含下列步驟:浸置具有多個孔洞的細菌纖維素膜於溶液中,所述溶液包含黃酮類化合物和多元醇;以及對浸置於溶液中的細菌纖維素膜進行熱處理,以使黃酮類化合物進入細菌纖維素膜的孔洞中。
