Cable force monitoring provides an important basis for the overall evaluation of cable technical status and then the performance of bridge overall structure. However, cable force monitoring is a long-term process, how to ensure the service life and test accuracy of the sensor in the long operation period is an urgent problem to be solved. The magnetic flux sensor cable force monitoring system solves the problem of sensor stress fatigue through non-contact measurement, and realizes data calibration of operating state through analog calibration, which has good durability and long-term performance.