In order to improve the service reliability of friction stir welded joints of high-strength aluminum alloy components for aviation and aerospace vehicles in corrosive environments, the stress corrosion behavior of 6 mm thick 6082–T6/7075–T6 dissimilar aluminum alloy friction stir welded joints treated with T6 was studied using metallographic analysis, electron microscopy analysis, and four-point bending stress corrosion method. The results showed that under the conditions of rotating speed 1200 r/min and weeding speed 80 mm/min, the 6082–T6/7075–T6 base material obtained a dense and well formed friction stir welded joint structure with an onion ring structure. The four-point bending stress corrosion of 6082–T6 and 7075–T6 base metal friction stir welded joints mainly occurs on the 7075–T6 aluminum alloy side on the retreating side, while the 6082–T6 aluminum alloy side on the advancing side shows good corrosion resistance. This is mainly due to the difference in electrode potential between dissimilar aluminum alloy base materials, which leads to galvanic corrosion of welded joints under stress. In addition, The formation of micro electric couples between the α–Al matrix and the second phase, as well as the presence of large angle grain boundaries in the TMAZ, HAZ, and BM regions of the welded joint, are also important reasons for stress corrosion.