The utility model relates to a self-supporting type circular tunnel combined support for an adjustable cable tunnel. The self-supporting type circular tunnel combined support comprises two supports, a jacking pipe and ten arc supports, wherein the arc supports are connected and fixed with connecting pieces through bolts, the jacking pipe and the two supports utilize a wedge-shaped adjusting block to support and lock the two supports towards the two sides of the tunnel box in a bolt connection screwing manner; and the cable layer frame and a supporting frame are fixed on the arc supports in a bolt connection manner. The self-supporting type circular tunnel combined support provided by the utility model is used for underground tunnel cable engineering, has cable circuits distributed effectively according to the space of the box, meets using requirements, is attractive in appearance, light in weight and convenient in installation, and simultaneously has the characteristics of high strength, corrosion resistance, high temperature resistance, space saving, adjustability, convenience in overhauling of maintainers and equipment running, and no damage to the tunnel box by the structural optimization and novel design combined with the improvement of material formula.