Far infrared heating fiber and preparation process thereof

The invention relates to the technical field of fiber materials, in particular to a far infrared heating fiber which comprises a fiber base material and a nanofiber membrane covering the outer side of the fiber base material, and nanometer heating powder is evenly dispersed in the fiber base material; the preparation method of the nano heating powder comprises the following steps: 1, mixing CuFe2O4 powder and SiO2 powder, drying, transferring into a calcining furnace, heating to 600-800 DEG C, and calcining for 15-20 minutes; step 2, taking out the calcined CuFe2O4 powder, grinding the powder to 200 meshes, and dispersing the powder into water to obtain a dispersion liquid; step 3, slowly dropwise adding a mixed solution of TEOS and absolute ethyl alcohol into the dispersion liquid for coating to obtain a coating solution; and step 4, washing, filtering, drying and grinding the coating liquid to obtain the nano heating powder. Through combination of different layers of heating powder and the fiber material, t