Optical fiber gyroscope frequency characteristic elevating method and device based on Faraday effect

The invention discloses an optical fiber gyroscope frequency characteristic elevating device based on a Faraday effect. An excitation current source comprises a signal generator, a conversion amplifying circuit and a current coil, wherein a sensitive light path comprises a light source, a circulator, a Y waveguide phase regulator, a polarization beam splitter, a polarization-maintaining fiber coil, a gamma/4 wave plate, a sensing optical fiber, a reflecting mirror and a detector; and an analog optical fiber gyroscope signal processing detection circuit comprises a front amplifying circuit, an A/D (Analog to Digital) converting circuit, a digital signal processing unit, a first D/A (Digital to Analog) converting unit, a second D/A converting circuit and a phase-locked amplifier. The Faraday effect applied in the invention is generated by exciting the sensitive light path with sinusoidal current, and a sinusoidal signal serving as an exciting signal can be output at a high frequency, so that the problem of limitation on the excitation signal output frequency during frequency characteristic test of an optical fiber gyroscope is solved, and evaluation of high bandwidth can be realized.