Abstract: Provided is a functional underwear support for men having active exercises such as running, marathon, and cycling in which the penis and the scrotum are separately accommodated independently of each other with high air permeability, the functional underwear support including a scrotum pocket which is formed with a functional fabric such as a mesh, a coolon, or a coolmax having a high air permeability, to entirely supporting the scrotum, a penis support cover which is formed by sewing a stretchable, soft spandex fabric fixedly supporting the penis so as not to be shaken to the both left and right ends of the scrotum pocket outer side, and a rechargeable motor fan unit which is provided to one side of the scrotum pocket to remove moisture or facilitate ventilation of the scrotum and the groin.