A kind of differential leverage sensitization structure fiber Bragg grating（ FBG） tilt angle sensor is developed. The tilt of the mass ball is converted to the perturbation of the cantilever beam by the leverage sensitization and pressure principle

and it eventually leads to changes in the wavelength of the FBG. Its mathematical model is derived. The sensor is processed according to the theoretical calculation

and the calibration test and repeatability test of the sensor are carried out. The experimental results show that the range of the FBG tilt sensor is -40°

40°

the sensitivity of the tilt sensor is 28. 6 pm/（ °）

the fitting degree of R

2

is 0. 997

and the repeatability is 0. 92 %.