The invention discloses a preparation technology of an ion-exchange polymer/metal dendritic interface. According to the preparation technology, an ion-exchange polymer is taken as a substrate film material, metal complex serves as main salt, and physical roughening, chemical plating and electroplating are adopted jointly to prepare an ion-exchange polymer metal composite with the dendritic interface. The preparation technology is realized through the following technologies that surface roughening treatment of a substrate film is conducted, specifically, in order to ensure the consistency of roughening, sandblasting is adopted to be conducted under the condition of the fixed time, the fixed pressure and the fixed sandblasting type; chemical plating is conducted, specifically, chemical plating comprises two steps of ion exchanging and oxidation reduction, according to the steps, a layer of surface electrodes is formed, substrate film surface resistance is reduced, and a carrier is provided for subsequent electroplating; and electroplating is conducted, specifically, the electroplating method introduced by the preparation technology is a necessary condition for formation of the dendritic electrode interface. The ion-exchange polymer/metal dendritic interface prepared through the chemical plating combining with electroplating technology has the advantages of being high in efficiency and low in cost, and the effective contact area of the prepared ion-exchange polymer/metal dendritic interface is large.