Wave plate temperature compensation system suitable for optical fibre current mutual inductor

The invention discloses a waveplate temperature compensation system suitable for a fiber current mutual inductor, which comprises a pre-amplifier circuit, a first D/A converter, a voltage following circuit, a second D/A converter, a FPGA processor and a DSP processor, wherein the FPGA processor for processing a signal includes a demodulation unit, a cumulative integration unit, and a temperature compensation parameter acquisition unit; the DSP processor for processing the signal includes a filter unit, a compensation parameter acquisition unit and a correction unit. The waveplate temperature compensation system of the invention can correct the output result of a fiber current mutual inductor closed loop system by an error compensation factor in the DSP processor by expanding the peak of an interference output result by square wave modulation with unequal duty ratios and by extracting the temperature error compensation factor of a lambada/4 waveplate by a voltage following channel without changing original plus or minus pi/2 square wave bias modulation and a closed loop signal detection signal fed back by a ladder wave.