For the shock reliability of high-sensitive fiber Bragg grating(FBG) vibration sensor, a dual cantilever FBG vibration sensor with a vibration restricting structures was designed. The relationship between the structural parameters, sensitivity and vibration displacement were analyzed, the structure was optimized and the limit of the vibration amplitude was determined. Sensor sample with a vibration restricting amplitude of about 90 μm was fabricated, and the acceleration sensitivity, frequency response, impact properties of the sensors were tested. The results show that the acceleration sensitivity of the sensor is about 525 pm/g, the resonance frequency is about 66 Hz, and after repeated shocks of about 50 g, the frequency response shows good reproducibility, which indicates that the sensor has a high reliability.