The invention discloses a production technology of an aluminum alloy sectional bar for an automobile bumper and belongs to the technical field of metal machining. The aluminum alloy sectional baral bar for the bumper is processed through the steps of mixing, melting, permanent magnetic stirring, temperature measurement, sampling, ingredient and temperature adjustment, turning down, refining(first purification), standing still, online addition of Al-Ti-B wire, online removal of gas and sand (secondary purification), two-stage filtration, same-level hot top casting, cast ingot homogenization, machining of cast ingot, inspection of cast ingot, heating of cast ingot by an induction furnace, extrusion, precise on-line quenching, stretching and straightening, aging, structure and property inspection of sectional bars, and delivery. The aluminum alloy sectional bar processed by the technology is excellent in thermal deformation performance, and high in strength due to on-line quenching during extrusion. The product has excellent welding performance and corrosion resistance, certain resistance to stress corrosion, and especially has strong shock absorption and folding resistance.