Our　self-built　dual-wavelength　single-frequency　fiber　laser　was　used　as　a　seed,　and　after　being　amplified　by　an　acousto-optic　modulator　and　multi-stage　fiber,　the　laser　was　injected　into　a　100-meter　long　high　nonlinear　fiber　with　the　zero-dispersion　point　of　at　1550　nm.　With　the　help　of　the　four-wave　mixing　effect　of　the　highly　nonlinear　fiber,　a　series　of　new　spectral　components　were　finally　obtained　under　the　pumping　of　the　peak　power　of　13　W,　and　a　total　of　46　new　spectra　were　generated　in　the　range　of　20　dB.　These　spectra　spanned　1.337　THz　and　contained　only　one　longitudinal　mode　in　each　spectrum.　Since　the　new　spectrum　was　generated　based　on　the　four-wave　mixing　effect,　there　was　no　gain　competition　between　different　spectra,　so　the　multi-wavelength　single-　frequency　of　the　laser　can　exist　stably,　and　the　spectral　intensity　was　close　to　each　other.　The　multi-wavelength　single-frequency　fiber　laser　not　only　has　the　advantages　of　a　single-frequency　fiber　laser　such　as　narrow　linewidth,　high　coherence,　and　low　noise,　but　also　can　simultaneously　output　multiple　wavelengths　of　single-frequency　lasers　in　an　all-fiber　structure,　which　makes　it　possible　to　have　very　important　applications　in　the　fields　of　multiplexing　optical　communication,　optical　frequency　conversion,　lidar,　microwave　photonics　and　so　on.　©　2022　Chinese　Society　of　Astronautics.　All　rights　reserved.