All-fiber current transformer early warning method and system, storage medium and computer equipment

The invention discloses an all-fiber current transformer early warning method, which comprises the following steps of: acquiring an output signal of a detector in a normal operation state, extracting a second harmonic amplitude and a light intensity average value, and reading a light source driving current of an electronic unit at the same time; collecting a detector output signal in a fault state, extracting a light intensity peak value, a second harmonic amplitude value, a fourth harmonic amplitude value and a light intensity average value, and detecting a light source driving current of an electronic unit; according to whether the difference between the second harmonic amplitude extracted in the normal state and the second harmonic amplitude extracted in the fault state is greater than a threshold value, selecting whether to enter a fault diagnosis system; according to the change of the ratio of the light intensity average value, the light source driving current and the second harmonic amplitude extracted