The natural light infrared therapy device according to the present invention relates to a natural light infrared therapy device that improves health by irradiating the human body with infrared rays separated from natural light, and more specifically, separates only infrared rays excluding ultraviolet rays, visible rays, etc. from sunlight using prisms. The present invention relates to a natural light infrared therapy device that improves health by extracting and irradiating the human body. The natural light infrared treatment device according to the present invention includes a light receiving unit 101 made of a bundle of optical fibers 109 to allow sunlight to enter； A light irradiation part 113 formed of one or more lines to form a straight line of the optical fiber of the light incident part 101, and an end of the optical fiber 109 perpendicular to the longitudinal direction of the optical fiber 109； A light irradiation part stator 111 supporting the light irradiation part 113； A main body 100 having a rectangular parallelepiped shape to fix the light irradiator stator 111 to allow overall support； and fixed to one surface to be parallel to one vertical side of the main body, and made of a transparent material. A triangular prism 103 formed of a triangular pillar having a triangular shape having the same shape as the top surface, and fixed horizontally to one side of the main body 100； A prism fixing support 105 for fixing the triangular prism 103 from up, down, left and right, and having a triangular prism fixing groove 125 formed on one side thereof to catch the triangular prism 103； An ultraviolet blocking plate 119 for absorbing and blocking a band having a short wavelength among the light refracted by the triangular prism 103； A reflector 123 for reflecting a band having a long wavelength among light refracted by the triangular prism 103 and outputting it to the outside； Infrared output unit 121 made of a transparent material for protecting the light reflect
