In this paper, a differential pressure fiber Bragg grating (FBG) static level meter is designed based on the basic principles of FBGs and connectors to achieve accurate and effective monitoring of the uneven settlement of building structures. The theoretical derivation, calibration tests and static characteristic analysis of the level meter are carried out. The experimental results show that the sensitivity of the level meter is 6.5 pm/mm, the linear fitting degree R2 is 0.999, non-linear error is 1.48%, hysteresis error is 0.74%, and repeatability error is 5.72%, resulting in a total accuracy of 5.95%. In order to increase the sensitivity of the level meter, the original corrugated diaphragm was improved and analyzed. The results showed that the sensitivity of the improved level meter was 11.87 pm/mm, which was about 1.8 times higher than the unimproved one. The settlement of buildings has been effectively monitored by using this type of level meter structure, providing effective technical support for the health monitoring of building structures.