The invention provides a discharging tensioning device on a preparation device of a conductive film and belongs to the field of functional films. The technical problem that a discharging roller can damage a film easily is solved by the discharging tensioning device on the preparation device of the conductive film. According to the discharging tensioning device on the preparation device of the conductive film, the preparation device further comprises a discharging roller and a material collecting roller; the discharging tensioning device comprises a shaft sleeve arranged on the discharging roller in a sleeving manner; a gap is formed between the shaft sleeve and the discharging roller; the inner wall of the shaft sleeve is evenly provided with a plurality of armature strips; the discharging roller is provided with winding piles corresponding to the armature strips one to one; and conductive guiding wires are wound on the winding piles. The discharging tensioning device on the preparation device of the conductive film has the beneficial effects of buffering the discharging roller and protecting the film.