Method for measuring safety distance between suspension arm of crane and running super high voltage transmission line

The invention relates to a method for measuring a safety distance between a suspension arm of a crane and a running super high voltage transmission line. The method comprises the following steps of: detecting a surrounding electric field intensity by using a detecting head arranged on the suspension arm, inputting a detection result into a comparison module and comparing the detection result witha pre-set value; using the strength of an electric field intensity signal as a start/stop signal of the operation of laser distance-measuring equipment; when the electric field intensity signal is higher than the pre-set value, scanning in a semispherical region to measure a distance by using the laser distance-measuring equipment; when the electric field intensity signal is lower than the pre-set value, stopping a distance detection module to reduce the power consumption of the entire detecting head; and arranging a data acquiring and displaying device in an operation room of the crane and transmitting the detection results of a high voltage electric field intensity detection module and the distance detection module to the data acquiring and displaying device in a radio signal transmitting mode so as to display, alarm or control externally. The invention also provides a corresponding safety distance measuring device which can adapt to electric transmission and transformation lines with different voltage levels and different working angles of the suspension arm and can realize low-consumption operation.