The invention relates to the technical field of reactor equipment states, in particular to a high-voltage shunt reactor iron core vibration measurement device and measurement method.The device comprises a reactor iron core arranged on a transformer oil tank, an optical fiber vibration sensor, an optical fiber coupler, an optical fiber bragg grating modulator and a computer; the reactor iron core and the optical fiber vibration sensor are correspondingly arranged, the optical fiber vibration sensor is connected to the optical fiber coupler, the optical fiber coupler is connected to the optical fiber bragg grating modulator, and the optical fiber bragg grating modulator is connected to the computer.According to the measurement device and measurement method, the reactor ion core generates vibration when a reactor operates, vibration force is transmitted to the optical fiber coupler through the optical fiber vibration sensor and then transmitted to the optical fiber bragg grating modulator through the optical fiber coupler, and a measurement result is obtained through the computer; measurement is very precise, and the vibration characteristics of the reactor ion core are effectively mastered.