Abstract: A novel high-sensitivity fiber Bragg grating (FBG) pressure sensor was designed, which was mainly composed of the setup of the opening loop and the aluminum-foil pipe. With the opening loop mechanism and the bandwidth code incorporated, the pressure sensor based on the bandwidth tuning principle of FBG is implemented for the temperature-independent pressure measurement. The experimental results indicate that the sensor is very sensitive to pressure, which is up to 2.50×103nm/MPa, and the experimental results agree with the theoretical analysis. The pressure sensitivity and measurement range can be designed and altered by changing the material and parameter of the opening loop and aluminum-foil pipe.