Three-component roadbed karst cave detection sensor and detection system

The invention discloses a three-component roadbed karst cave detection sensor. The three-component roadbed karst cave detection sensor comprises a columnar shell, a top cover matched with the upper end of the shell by threads, a bottom cover matched with the lower end of the shell by threads, a micro-processing unit arranged in the shell, a power supply board connected to the micro-processing unit and a sensor signal cable connected to the micro-processing unit, wherein the power supply board is a differential power supply board and used for supplying differential voltage to the entire three-component roadbed karst cave detection sensor, the power supply board is transversely arranged on the lower end of the shell, a ASIC circuit and three sensor power supply slots are arranged on the lower end of the differential power supply board, and the set positions of the three sensor power supply slots are matched with the locating places of three single-component sensors; the bottom cover is in a conical shape, multiple layers of stepped tables are distributed in the longitudinal direction of the bottom cover, so that MEMS micro-electronic sensing modules of the three orthogonal single-component sensors can contact the stepped tables at a maximum area. The invention also discloses a three-component roadbed karst cave detection system.