To monitor the water level of the well field in the in-situ leaching uranium mine in real time, a real-time monitoring sensor for the water level of in-situ leaching uranium mining based on Fabry-Perot(F-P) cavity is designed. The cavity length of t he sensor is controlled by an electric precision displacement platform and a custom fixture. The sensing head is fabricated by bonding and coupling silicon wafers, bases, and ceramic ferrules. Field verification tests are conducted in a certain in-situ leaching uranium mine in Inner Mongolia. The results indicate that the sensor's pressure measurement range is 0 to 1.5 MPa, with a pressure sensitivity of 1.68 μm/MPa and linearity of 0.998, achieving online monitoring of water level parameters in production wells.