To tackle the uneven settlement monitoring problem of building structures, we design a new static level with double fiber Bragg gratings based on equal strength beams. According to the basic theory of the communicating vessel principle, the sensing principle of the static level is explained, and it is concluded that the sum of wavelength changes in the two fiber Bragg gratings has a linear relationship with settlement changes. The level mainly includes a cylindrical container, a connecting rod, a cylindrical float, a cantilever beam with equal strength, fiber Bragg gratings, and a bottom support, and a leak-proof connecting device is used at the water pipe joint. The static characteristics of the static level are analyzed with the calibration data. The sensitivity is 15.765 pm·mm ^-1, the linearity error is 2.959%, the hysteresis error is 0.375%, the repeatability error is 1.744%, the correlation coefficients are all above 0.99, and the static error is 3.455%. The results above meet the requirements of structural health monitoring in civil engineering and are suitable for the long-term remote monitoring of uneven settlement of various structures. The designed double fiber Bragg grating static level has the advantages of convenient disassembly and reassembly and can eliminate the errors caused by temperature changes and liquid level changes, improving the accuracy of uneven settlement monitoring. The application of the double fiber Bragg grating static level to building monitoring proves its ability to monitor uneven settlement.