The utility model discloses a strata displacement monitoring devices relates to the geotechnical engineering field. Strata displacement monitoring devices includes coaxial cable prague electricity bars strain sensor, the signal demodulation appearance, wireless transceiver module, solar energy power module and dado steel pipe, when coaxial cable prague electricity bars strain sensor produces tensile strain because of rock stratum production displacement receives the exogenic action, make the electromagnetic reflection peak frequency of propagating among the coaxial cable produce the skew, reflected signal conveys to the signal demodulation appearance and carries out the demodulation, rock stratum stress information is sent to the monitoring center by wireless transceiver module, the atresscondition of real -time supervision target rock stratum, carry out the early warning to strata displacement. The utility model discloses a strata displacement monitoring devices, solid structure, measuring range is wide, can work at extreme environments, avoids taking place the rock stratum well drilling stopper that leads to straggly and dies and cause the electric bars signal interruption amongthe coaxial cable, and monitor effect is better.