The present invention relates to a telegraph pole for an underground cable, including a pole body, a transformer, and a transformer case. The pole body stands upright with a lower end thereof buried under the ground, and is internally equipped with a service wire connected to a main wire buried under the ground, an electric circuit, a high-tension line for receiving high voltages from the service wire, and a low-tension line for supplying low voltages to an electricity consumer cable buried under the ground. The transformer is installed on the top of the pole body, transforms high voltages input from the high-tension line into low voltages and outputs the low voltages to the low-tension line. The transformer case is arranged outside the transformer to protect the transformer. The telegraph pole for an underground cable of the present invention has advantages of minimizing the space occupied by a transformer and a switch during construction of the underground cable, ensuring safety of people from high voltage wires, and achieving advertising effects and aesthetic enhancement in a city landscape by attaching advertising materials or installing lighting fixtures on the transformer case.
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