Abstract: To improve the mechanical properties of 7075-T6 aluminum alloy fusion welded joints, the welding with reinforcement rolling process was proposed. In-situ rolling of the weld reinforcement was performed during the welding process using a self-designed welding with rolling device. Vickers hardness tester and universal testing machine were used to show the hardness distribution and tensile strength of the joint at different rolling temperatures. The microstructure of the fusion zone (FZ) and heat-affected zone (HAZ) were observed by scanning electron microscope configured with EDS and EBSD. The finite element simulation model of the 7075-T6 aluminum alloy welding with reinforcement rolling was established. The results show that the hardness of the FZ and the solid solution region in HAZ of the joints can be significantly improved by the WR process, and the strength coefficient of the joints reaches about 81.4%, which is 24% higher than that of the conventional arc welded joints. Mechanical properties are significantly improved due to the increase in low angle grain boundaries and dislocation density, with less correlation to grain size and second phase distribution.