The invention relates to the field of metal vibration and noise reduction technologies, and discloses an impact reduction device of a vibration sensor and a method for manufacturing the impact reduction device. The impact reduction device comprises three layers of plates which are sequentially arranged at intervals from top to bottom. The upper-layer plate and the intermediate-layer plate are fixedly connected with each other by first fixing assemblies which perpendicularly penetrate the plate surfaces of the upper-layer plate and the plate surfaces of the intermediate-layer plate, and the lower-layer plate and the intermediate-layer plate are fixedly connected with each other by second fixing assemblies which perpendicularly penetrate the plate surfaces of the intermediate-layer plate and the plate surfaces of the lower-layer plate; the first fixing assemblies and the second fixing assemblies are arranged in a staggered manner. The impact reduction device and the method have the advantages that impact energy of high-impact signals on the vibration sensor can be weakened on the premise that structural forms of original sensors are not changed and influence on correct vibration signal measurement of the vibration sensor is prevented, and accordingly requirements of high-magnitude impact test conditions can be met; the impact reduction device is short in development and production cycle and can be used with the existing vibration sensor, and accordingly the time and large quantities of costs can be saved for aerospace models.