The invention discloses an alloy aluminum rod containing rare earth elements and a preparation process thereof, and belongs to the field of preparation of aluminum alloy materials. The alloy aluminumrod comprises the following components of, in percentage by weight, 1.5%-3.3% of Mg, 0.7%-1.1% of Si, 1.0%-1.7% of Cu, 0.04%-0.1% of Fe, 0.35%-0.7% of Mn, 0.2%-0.6% of Ni, 0.07 %-0.12% of Ti, 0.15%-0.3% of Y, 0.07%-0.1% of Er, 0.05%-0.11% of Gd, 0.07%-0.24% of La, not more than 0.5% of impurity elements of other metals and nonmetals, and the balance Al. The alloy aluminum rod is prepared through the steps of melting, alloying, refining, ingot casting, homogenization treatment, extrusion molding and the like. By adding the rare earth elements, the dendritic crystal web cell structure can be refined, iron with needle-like structure in aluminum liquid can be transformed into particles, so that the corrosion resistance and mechanical properties of the aluminum rod are improved and the surfaceroughness of aluminum alloy parts prepared by the aluminum rod are reduced. The alloy aluminum rod prepared by the method has high strength, high plasticity, excellent corrosion resistance, no tendency of exfoliation corrosion, stress corrosion and intergranular corrosion, good processing and welding performance, is suitable for manufacturing automobile parts, and has excellent industrial application value.