The invention discloses a method for preparing a polyaniline/manganese dioxide composite material for a super capacitor, which adopts permanganate as an oxidizer to oxidize aniline to directly obtain the polyaniline/manganese dioxide composite material. The method can ensure the contact of manganese dioxide and polyaniline at molecular level by oxidizing the aniline by the permanganate, has no animpurity phase after a reaction at the same time, and simplifies subsequent treatment work. The method for preparing the polyaniline/manganese dioxide composite material for the super capacitor has the advantages of simple process, convenient operation and convenient control, ensures that the electric conductivity of the prepared polyaniline/manganese dioxide composite material is effectively improved, and is suitable for mass industrial production.