In the LiNbO3 phase modulator scheme of the all-fiber-optical current transformer, the polarization maintaining fiber (PMF) is mainly responsible for signal transmission between the high-voltage and low-voltage sides of the collection system. Based on the Faraday magneto optical effect, the influence of the magnetic field generated by the primary current on the optical signal phase can be used to reflect the value of the current. Vibration and shock can affect the transmission of signals in polarization maintaining fibers, causing additional phase differences. Therefore, this paper explores the influence of impacts of different intensities and accelerations, as well as vibrations of different frequencies and accelerations, on polarization maintaining fibers by simulating object drop test, vibration bed impact vibration test, and vibration bed sweep frequency vibration test. In addition, wrap different damping materials at different positions of the polarization maintaining fiber box to explore the buffering effect of these protective measures on the aforementioned vibration and impact.