The utility model provides a high voltage power transmission line equipment power supply device which comprises an energy taking end arranged on a high voltage power transmission line and a power supply end arranged on an iron tower. The energy taking end comprises a current transformer, a rectifier circuit, a driving circuit and a laser which are sequentially connected. The current transformer sleeves a high voltage power transmission line. The power supply end comprises a photoelectric cell and a storage cell. The photoelectric cell and the laser carry out energy transmission through a laser signal. The output end of the photoelectric cell is connected to the input end of the storage cell. According to the high voltage power transmission line equipment power supply device, the electromagnetic induction principle is used to sense and obtain electric energy from the high voltage power transmission line, the laser energy of non-contact high voltage electricity is transmitted to the iron tower, then the energy is converted into electric energy by using the photoelectric cell, a long-term and stable working power supply is provided for each equipment on the power transmission line, the device is not affected by the factors of environment, climate and temperature, and the safety influence on the high voltage power transmission line is prevented.