The present invention relates to a method for generating far-infrared polarized light. The method comprises the following steps: providing a carbon nanotube structure, wherein the carbon nanotube structure comprises a first carbon nanotube structure and a second carbon nanotube structure, the first carbon nanotube structure comprises a plurality of first carbon nanotubes extending in the same direction, the second carbon nanotube structure comprises a plurality of second carbon nanotubes randomly dispersing on the surface of the first carbon nanotube structure, and the plurality of second carbon nanotubes are arranged in overlap joint with the plurality of first carbon nanotubes; pre-processing the carbon nanotube structure to remove at least a portion of the second carbon nanotubes to obtain the preprocessed carbon nanotube structure; arranging the preprocessed carbon nanotube structure on a side of the light emission surface of a far-infrared light source; exciting the far-infrared light source to generate far-infrared light, and allowing the far-infrared light to be emitted through the preprocessed carbon nanotube structure; and heating the preprocessed carbon nanotube structure.