Abstract: In order to improve the bonding strength between polylactic acid (PLA) and aluminum alloy, PLA was reinforced by adding basalt fiber(BF). PLA and BF after drying were mixed by torque rheometer, and aluminum alloy surface was textured by fiber laser. The BF/PLA composites and the treated aluminum alloy were joined by a flat vulcanizing machine. The tensile strength of the BF/PLA-aluminum alloy composites was tested and the fracture surface was analyzed after failure. The results show that with the increase of BF mass fraction, the BF/PLA-aluminum alloy bonding strength shows a trend of strengthening first and then decreasing, and the increase of fiber mass fraction affects the crystallization and nucleation of the BF/PLA composite. Based on the experimental results, the finite element analysis model was established to simulate the tensile process of BF/PLA-aluminum alloy. The results show that the model can accurately restore the tensile process.