6. Strata subsidence self-recording layered monitoring system: the main purpose is to improve the monitoring of the magnetic ring layered strata subsidence monitoring well through the development of fixed-point multi-soil automatic monitoring equipment, in conjunction with the existing magnetic ring layered strata subsidence monitoring well efficacy. The mechanism is to use the Hall element to convert the magnetic field strength received into a voltage signal (Hall effect) and other electromagnetic characteristics. The Hall element magnetic ring sensor is developed, with the magnetic ring layered formation subsidence monitoring well each magnetic ring Depth position and the characteristics of each monitoring soil layer change. A Hall element magnetic ring sensor of appropriate length is arranged at a specific position to periodically return the magnetic ring position signal to monitor the position change of the stratum at different times.