Weak current inversion method and system based on unmanned aerial vehicle sensor

The invention discloses a weak current inversion method and system based on an unmanned aerial vehicle sensor. The method comprises the following steps: controlling an unmanned aerial vehicle carrying a sensor to hover at any position within a preset range from a to-be-detected electrified wire; taking the center of the fuselage of the unmanned aerial vehicle as a rotation center, controlling the unmanned aerial vehicle to perform fixed-point rotation for preset turns, and obtaining magnetic field data measured by the sensor; according to the magnetic field data, the current on the to-be-measured electrified wire and the distance between the unmanned aerial vehicle and the to-be-measured electrified wire are obtained through back-stepping calculation. An unmanned aerial vehicle is adopted to carry a single sensor to measure a magnetic field around a to-be-measured electrified wire, and the current on the wire and the distance between the unmanned aerial vehicle and the wire are obtained through accurate inver