Series resistor type underground oil-water interface detection system controlled by pressure-controlled switches

The utility model provides a series resistor type underground oil-water interface detection system controlled by pressure-controlled switches. The system comprises a ground detector, and an oil-water interface detection sensor set connected with the ground detector through an amour cable, wherein the oil-water interface detection sensor set is composed of five oil-water interface detection sensors. By the adoption of the system composed of the five oil-water interface detection sensors and the ground detector, continuous measurement of an underground oil-water interface can be achieved, the depth range and precision of underground oil-water interface detection are improved, the frequency of lifting of an outer cavity construction pipe is reduced, cavity construction cost is reduced, and the requirement of a novel reverse circulation cavity construction engineering technology for underground oil-water interface measurement is met.