Laser-TIG double-side welding (LTDSW) for aluminum alloys was explored. The double-side welding for 4 mm and 10 mm thick 5A06 aluminum alloys was implemented, and the characteristics of LTDSW were investigated. The results show that the technology combines the advantages of laser and TIG. Stable process and good welding appearance were obtained. Other remarkable advantages, such as increasing joint penetration, deceasing welding defects, enhancing productive efficiency, reducing welding cost, were also achieved. The reliable join for 4 mm thick aluminum alloys was realized with 1.0 kW laser power. Compared with laser welding, the pore amount of LTDSW is descreased. The pore distribution is mainly determined by the energy ratio of laser and arc. The amount and size of pore are mainly determined by the welding heat input. The average tensile strength of joints is 310 MPa, about 88% of base metal.