With the increasing costs of heavy-metal wastewater treatment and stricter requirements of environmental legislation, traditional chemical and electroplating methods are expected to be replaced by magnetron sputtering, which is gradually becoming a common technique for preparing the metal coatings on optical fibers. Magnetron sputtering processing parameters have a significant impact on the mechanical properties of fibers. This study investigates the influence of the magnetron sputtering process on the tensile properties of metal-coated fibers, to optimize the relevant process parameters. Prior to the formal preparation of metal coatings, pre-treatments such as laser stripping, fiber assembly, and plasma cleaning were employed. The microstructures of metal coating were characterized using scanning electron microscopy, and the tensile strength of metal-coated fibers was tested using a universal testing machine. The results reveal that pre-treatment has minimal effect on the tensile strength of fibers. However, variations in sputtering power, gas pressure, and deposition time (thickness) significantly affect tensile properties of fibers. Additionally, fibers coated with metals having elastic moduli close to SiO₂ exhibit higher tensile strength. In summary, the magnetron sputtering process has a crucial impact on the tensile properties of metal-coated fibers, and the optimization of process parameters can improve the mechanical performance of fibers, providing foundational support for their stability and reliability in various applications.