The utility model discloses a protector specialized for laying secondary cables, which comprises a base, a tank box and a protective cover. The protector is characterized in that: the base comprises a crossbeam; two sides of the crossbeam are provided with supporting legs; the tank box is recessed and is arranged on the crossbeam of the base; two ends of each of the two side walls of the tank box are respectively provided with an insertion port and a pin which correspond with each other; the protective cover is of a reverse recessed tank shape and is buckled on the tank box. Two ends of the top surface of the protective cover are respectively provided with insertion holes and bolts which correspond with each other. The distance between the inner walls at two sides of the protective cover corresponds with the distance between the outer walls at two sides of the tank box. The heights of the two side walls of the tank box above the supporting legs correspond with the height of the inner walls at two sides of the protective cover. The protector has advantages of novel design and reasonable structure. The protector is composed of the base, the tank box and the protective cover; wherein the protective cover and the tank box are assembly in an open manner. Technical problems of inconvenient secondary wiring and easy blocking in a closed PVC pipe are settled.