Optical fiber monitoring system for underground temperature and pressure

The utility model discloses an optical fiber monitoring system for underground temperature and pressure. The optical fiber monitoring system comprises a computation and demodulation device, a temperature sensor and a pressure sensor, wherein the computation and demodulation device is arranged on the ground surface and is connected with the underground temperature sensor and pressure sensor by optical cables, and the pressure sensor is an F-P (Febry-Parot) cavity pressure sensor. The optical fiber monitoring system for the underground temperature and pressure has the advantage that the F-P cavity pressure sensor is adopted to measure the pressure under an oil and gas well, and the pressure of each layer under the oil and gas well can be reliably measured, thereby effectively solving the problems of inaccurate measurement and unable measurement of underground pressure caused by the FBG (fiber Bragg grating) failing to endure the environment under the oil and gas well.