The invention belongs to the field of aluminum alloy production and relates to a production process of a high-performance aluminum alloy extruded bar. The high-performance aluminum alloy extruded bar contains the following formula constitution components in percentage by weight: 1.15%-1.30% of Si, 0-0.30% of Fe, 0.05%-0.10% of Cu, 0.55%-0.75% of Mn, 1.0%-1.1% of Mg, 0.15%-0.25% of Cr, 0-0.20% of Zn, 0-0.05% of Zr, 0-0.05% of Ti, 0-0.01% of Pb and the balance of Al. The preparation method comprises the following steps: casting, homogenization, extrusion and thermal treatment. By utilizing a sectional gradient solid solution method in a thermal treatment process of the extruded aluminum alloy bar, the temperature difference between the surface and the center of the aluminum alloy bar is reduced, meanwhile, the high-temperature standing time of the aluminum alloy bar is shortened, and the generation of coarse-grain rings is effectively avoided in the condition that the mechanical property is guaranteed, so that the prepared aluminum alloy bar has very high mechanical property, macrostructure crystalline grains are accordant with the standard, meanwhile, the quality of the aluminum alloy bar is improved, and the service life of the aluminum alloy bar is prolonged.