The invention discloses an all-fiber high-power middle- and far-infrared super-continuum spectrum light source. The all-fiber high-power middle- and far-infrared super-continuum spectrum light source is characterized by comprising a thulium doped mode-locking fiber laser module, a thulium doped fiber amplification module, a first super-continuum (SC) spectrum generation module and a second SC spectrum generation module which are sequentially arranged, wherein the thulium doped mode-locking fiber laser module is used for generating a high-repeated frequency ultrashot pulse picoseconds or femtosecond, the thulium doped fiber amplification module is used for generating a high-power and high-order soliton pulse, the first SC spectrum generation module is used for generating high-power SC spectrum laser of 2-5 micrometers, the second SC spectrum generation module is used for generating high-power SC spectrum laser of 2-14 micrometers, and the thulium doped mode-locking fiber laser module, the thulium doped fiber amplification module, the first SC spectrum generation module and the second SC spectrum generation module all employ single-mode fibers. The all-fiber high-power middle- and far-infrared super-continuum spectrum light source has the advantages of low cost, high conversion efficiency, good output beam quality, wide bandwidth, simple and compact structure and high adaptive capacity to an environment.