Method and device for measuring laid length of any section of buried cable

The invention discloses a method and device for measuring the laid length of any section of a buried cable. The method is characterized by comprising the following steps: an output terminal of a terminal machine is connected with a core wire at a certain end of a cable to be measured, and frequency modulation (FM) radio station antennae are erected on the ground to facilitate communication; an on-site machine moves to any point on the ground along the burying direction of the cable to be measured, is electrified to start up, and then starts measuring through off-site coordination by voice; the on-site machine sends time synchronization reference pulses to the off-site terminal machine and receives the synchronization reference pulses and the transmitting reference pulses generated by the triggering of the synchronization reference pulses fed back by the terminal machine by adopting free-space FM waves, so as to determine the transmitting time basic point of the terminal machine in an off-site manner; the on-s