The invention provides a preparation method for an aluminum foil current collector. The method comprises the steps of: providing a clean aluminum foil, placing it in chemical vapor deposition equipment, and performing sealing; introducing a protective gas into the equipment, at the same time turning on a vacuum system, starting heating when the air pressure is 1-100Pa, then turning on plasma equipment when heated to 500-600DEG C, introducing a carbon-containing gas, maintaining the status for 100-300min, at the end of reaction, stopping heating, turning off the plasma equipment, stopping introducing the carbon-containing gas, and carrying out cooling to room temperature in a protective gas atmosphere, thus obtaining aluminum foil current collector with grapheme growing on the surface. The preparation method for the aluminum foil current collector provided by the invention has a simple preparation process, the contact internal resistance between the prepared aluminum foil current collector with grapheme growing on the surface and a battery active material is greatly reduced, and the phenomenon of embedding lithium ions into the aluminum foil can be prevented, so that the cyclic stability and service life of the lithium ion battery can be improved.