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The application discloses a kind of silver nanowire-polyimide flexible transparent electrode film of nano-porous structure and its preparation method and electrode, method: silver nanowire suspension and polyimide solution are coated on substrate in turn, after solution diffusion is uniform, gradient heating solidification is carried out, and semi-embedded silver nanowire-polyimide flexible transparent electrode film is prepared after peeling off;It is soaked in organic solvent, after taking out, it is sealed in autoclave and carbon dioxide is introduced, it is placed in low-temperature constant-temperature reaction bath, and carbon dioxide is adsorbed to saturation;Release autoclave pressure, after taking out flexible transparent electrode film, it is heated and foamed, and obtain silver nanowire-polyimide flexible transparent electrode film with nano-porous structure;Film is prepared by the above preparation method;Flexible transparent electrode includes the above electrode film;The application can improve the comprehensive performance of silver nanowire-polyimide flexible transparent electrode.