The invention discloses a positioning device for cable rod installation. The positioning device comprises a fixed base, a positioning mechanism, a fastening mechanism and a stretching mechanism. The lower surface of the fixed base is fixedly provided with a plurality of sets of universal wheels, and one side of the universal wheels close to the middle of the fixed base is provided with an anti-slip mechanism. The anti-slip mechanism is composed of a telescopic rod and a fixed block. The upper end of the telescopic rod is fixedly disposed on the lower surface of the fixed base, the lower end ofthe telescopic rod is connected with the fixed block, a plurality of fixed rods are fixedly disposed on the upper surface of the fixed base, the upper ends of the fixed rods are connected with the positioning mechanism, and the fastening mechanism and the stretching mechanism are both mounted on the positioning mechanism. The positioning device has the advantages of being simple in structure, convenient to operate, reasonable in design, capable of effectively positioning and installing cable rods without use of a large crane for collaborative work, more rapid and stable in installation and capable of reducing the workload of workers and reducing safety hazards.