A narrow-linewidth, low-noise hybrid integrated external cavity laser at 1550 nm is fabricated, the polarization maintaining fiber Bragg grating (FBG) as optical feedback component is coupled with the semiconductor gain chip, and the laser linewidth is reduced by the large group delay characteristics at the sloping side of the FBG reflectance spectrum. The butterfly-packaged laser realizes a single longitudinal mode and polarization-maintaining output of the single polarization laser, including the output power ≥30 mW with integral linewidth of 15.9 kHz at 1 kHz, the Lorentz linewidth of 4.85 kHz, the intrinsic linewidth of 4.06 kHz, the relative intensity noise ≤-155 dB·Hz -1 at 1 MHz, the polarization extinction ratio >25 dB, the current tuning range without mode hopping ≥8 GHz, the temperature tuning range without mode hopping ≥14 GHz, the power stability of 1.7% within 6 h, and the frequency variations <50 MHz.