The invention relates to a polarization-maintaining distributed feedback fiber laser and a production method thereof and belongs to the technical field of fiber lasers. The laser comprises a pumping source, a phase-shifted fiber grating, a polarization-maintaining wavelength division multiplexer and a polarization-maintaining isolator, wherein a single-mode fiber is arranged at the front end of the phase-shifted fiber grating; and a polarization-maintaining fiber is arranged at the rear end of the phase-shifted fiber grating. Pump light generated by the pumping source is transmitted to the phase-shifted fiber grating through the single-mode fiber and is output to the polarization-maintaining wavelength division multiplexer through the polarization-maintaining fiber; linearly polarized narrow linewidth laser light and residual pump light are output; and the linearly polarized narrow linewidth laser light forms polarization-maintaining narrow linewidth laser light to output through the polarization-maintaining isolator. A distributed feedback structure is adopted by the laser, so that the structure of the laser is simpler, the single-longitudinal mode output characteristic is more stable and relative intensity noise and phase noise of the laser light are lower; and the laser light has the linear polarization-maintaining characteristic due to polarization-maintaining output and meets the application requirements of a sensing system with polarization-maintaining demands, so that the selectivity is more flexible when people select.