A metal foil that has a carrier and a preparation method thereof. The metal foil with a carrier comprises a carrier layer, a barrier layer, a striping layer, and a metal foil layer. The carrier layer, the barrier layer, the striping lay, and the metal foil layer are sequentially stacked, or the carrier layer, the striping layer, the barrier layer, and the metal foil layer are sequentially stacked. The diffusion depth of the carrier layer to the metal foil layer is less than or equal to 3 μm and the diffusion depth of the metal foil layer toward the carrier layer is less than or equal to 3 μm at a temperature of 20-400° C. By setting the barrier layer, the carrier layer and the metal foil layer are prevented from diffusing mutually to cause bonding at a high temperature, so that the carrier layer and the metal foil layer are easy to peel off.