The invention belongs to the technical field of solar batteries, in particular relating to a synergy method of a surface plasmon metallic nano-chain in a solar battery. In the process of manufacturing the solar battery, a layer of metallic nano-film consisting of the metallic nano-chain is manufactured between the back electrode and photovoltaic layer of the solar battery. An incident light is localized on the surface of the metallic nano-chain after passing through a light cathode and the photovoltaic layer to form a horizontally transmitted surface plasmon transmission mode, therefore, the effective transmission distance of the incident light at the photovoltaic layer is greatly increased, thereby, improving the absorption efficiency of the solar battery to the incident light and greatly improving the photoelectric conversion efficiency of the solar battery. The technology further has the advantages of diversified manufacturing processes, low manufacturing cost, obvious synergy effect and the like.