The embodiment of the invention discloses a
wireless power supply method and device for high-
voltage on-line monitoring equipment. With the method and device, a problem of low power supply reliability of the
wireless power supply method of the existing high-
voltage on-line monitoring equipment and problems of a power supply distance, power and efficiency, power supply stability and reliability, and power supply cost can be solved. The method comprises: step one, an energy-taking coil takes energy out from a high-
voltage bus in an electro-magnetic induction manner and AC / DC and DC / AC voltage conversion is carried out to convert 50-Hz alternating currents into high-frequency alternating currents; step two, a transmitting coil disperses the energy of the high-frequency alternating currents to the surrounding space and thus a high-frequency
electromagnetic field is formed in the space, targeted transmission of the energy is carried out by using a domino
relay coil, and a receiving terminal receives the energy; and step three, after the receiving terminal receives the energy, power conversion
processing is carried out and then the converted power is provided for a storage battery and a load.