VLF (very low frequency) communication station broadcast delay calibration method and VLF communication station broadcast delay calibration system

The invention provides a very-low-frequency communication station broadcast delay calibration method and system. The method comprises the following steps: erecting very-low-frequency signal detection equipment at a set distance of a communication station; the very-low-frequency signal detection equipment receives a very-low-frequency signal, compares the very-low-frequency signal with a clock phase of the very-low-frequency signal detection equipment, calculates and obtains a signal propagation delay inequality by considering phase lag caused by the distance between the very-low-frequency signal detection equipment and the very-low-frequency communication station, and transmits the signal propagation delay inequality back to the very-low-frequency communication station; the very-low-frequency communication station modulates the signal propagation delay inequality into a very-low-frequency signal broadcasted by the very-low-frequency communication station, a receiving user receives and demodulates the very-low