The invention discloses a conductive film replacing aluminum foil and a preparation method thereof. The conductive film replacing aluminum foil includes a metal layer, an intermediate reinforcing layer and a polymer film layer, and the intermediate reinforcing layer is arranged on both sides of the polymer film layer. , the metal layer is arranged on the outside of the middle reinforcing layer, the surface resistance of the conductive film is 10-80mΩ, the tensile strength is 150-350Mpa, the elongation at break is 75-150%, and the elastic modulus is 3500- 5500, the bonding force between the middle reinforcement layer and the metal layer is greater than 2N / 15mm, the bonding force between the polymer film layer and the middle reinforcement layer is 2‑4N / 15mm, and the water vapor transmission rate is <0.2g / (m 2 .24h), oxygen transmission rate <0.005cm 3 / (m 2 .24h). This conductive film that replaces aluminum foil can be made very light and thin, with a thickness of 3-20 microns. At the same time, the coating has a strong bonding force, is not easy to oxidize and fall off, has high barrier properties, good conductivity, and has light, thin, high strength and good toughness. Features, effectively solve the problems of high hardness and high tensile strength of pure aluminum foil, but small tear strength, easy to tear, high cost and heavy weight. It can be used to replace traditional aluminum foil in the fields of optical film, thermal protective coating, shielding film, high-end food / drug / cosmetic packaging with better barrier properties, electronic devices and batteries.