The invention discloses a sun treatment cabin, which comprises a rotating portion, a fixed supporting portion and a sleeping cabin bottom, wherein the rotating portion comprises a rotating sphere anda rotating device, the rotating device controls the rotating sphere to rotate, the size of the sleeping cabin bottom is slightly less than that of the rotating sphere, the rotating sphere can rotate around the sleeping cabin bottom, the cross section of the rotating sphere is a great circular arc, the cross section of the sleeping cabin bottom is a small circular arc, an opening portion of the rotating sphere forms a cabin door of the rotating sphere, and the sleeping cabin bottom and the rotating sphere can form the whole sphere in an enclosing manner. The sun treatment cabin can be conveniently applied to sun treatment and is convenient to be installed and used, and adjustment for functions of the sun treatment cabin is realized through the control of the rotating sphere.