The utility model relates to a combined cable fixing bracket, and belongs to the technical field of cable fixing tools. The fixing device is composed of a fixing base plate and supporting rings, an assembling sliding groove is formed in the fixing base plate, fixing lug plates are arranged at the two ends of the fixing base plate respectively, installing fixing holes are formed in the lug plates,and the supporting rings are movably installed on the fixing base plate through the assembling sliding groove. The supporting ring is arranged between the fixing base plate. the fixed plate and the movable plate of the supporting ring are detachable from the mounting base; therefore, the fixed base plate and the mounting base can be conveniently mounted and fixed on the wall of a bridge, a tunnelor a culvert; meanwhile, the mounting base is in threaded connection with the fixing plate; therefore, the direction of the fixed plate and the direction of the movable plate can be adjusted conveniently, the problems that most of existing brackets are triangular supports, are affected by the environment, are limited in structure and complex in fixing process, and are prone to causing large wasteare solved, and the bracket is particularly suitable for being fixed to the wall of a bridge or a tunnel or a culvert in the cable laying process.