The invention relates to a graphene and rare earth scandium synergistically-reinforced cast aluminum alloy and application of the graphene and rare earth scandium synergistically-reinforced cast aluminum alloy to the aspect of an automobile hub. The graphene and rare earth scandium synergistically-reinforced cast aluminum alloy is prepared from the raw material components in percentage by mass: 6.0-8.0% of Si, 0.20-0.45% of Mg, 0.50-0.60% of Sc, 0.003-0.007% of graphene, less than or equal to 0.05% of Li, less than or equal to 0.05% of Be, less than or equal to 0.05% of B, less than or equal to 0.05% of Na, less than or equal to 0.05% of P, less than or equal to 0.10% of Ti, less than or equal to 0.10% of V, less than or equal to 0.05% of Cr, less than or equal to 0.10% of Mn, less than orequal to 0.10% of Fe, less than or equal to 0.05% of Ni, less than or equal to 0.10% of Cu, less than or equal to 0.10% of Zn, less than or equal to 0.05% of Zr, less than or equal to 0.05% of Sn, less than or equal to 0.10% of Pb and the balance of Al. The graphene and rare earth scandium synergistically-reinforced cast aluminum alloy has excellent comprehensive mechanical performance and electrical conductivity performance and is especially suitable for the aspect of the automobile hub.