A silver nano conductive film protected by ammonium tungstate comprises a silver nanowire layer and an ammonium tungstate layer, and is prepared by coating a silver nanowire film with the thickness of100-400nm on a substrate and then spraying an ammonium tungstate layer with the thickness of 10-100nm on the surface of the silver nanowire film. The preparation temperature is low, a substrate is not selected, and the silver nanowire transparent conductive film can be prepared on various rigid and flexible substrates. The ammonium tungstate protective layer can increase the adhesive force and scratch resistance of the film; the service life of the conductive thin film is prolonged, the conductive stability is improved, and the conductive performance is improved; the prepared conductive thinfilm is good in uniformity, the light transmittance reaches 84-88%, and the square resistance is as low as 6-12 ohm/sq. According to the invention, the method is suitable for preparing a large-area uniform conductive thin film; when used for preparing the organic thin-film solar cell, the silver nano conductive film can be directly used, and the energy level matching can be realized without an additional buffer layer.