The C band polarization-maintaining fiber amplifier is designed with integrated all-fiber structure. Combined with the unique polarization control technology and the leading polarization-maintaining fiber welding process, the amplifier can achieve high extinction ratio and linear polarization output while obtaining high output, and the output power can reach up to 10W. This amplifier is a complete turn-key system, which is controlled by microprocessor internally, and displays the pump current, temperature and other working conditions in real time through the LCD of the front panel, and can provide alarm information in time, with clear interface and easy operation.