This invention relates to a kind of monitoring device apply to interference type fiber-optic gyro. The first processor D4 receive gyro output serial port data, pin_1 signal, pin_2 signal, light-sourcetemperature-control fault0_1 signal, light-source temperature-control fault1_1 signal, light-source temperature-control fault0_2 signal, light-source temperature-control fault1_2 signal, power 3V3_DP1signal. The first processor's level conversion circuit receives data information output by first processor D4; the second processor D8 respectively output power supply control signal to power supplyc ontrol switch D10 of gyro sensing circuit and secondary light source. The invention adopts two CPU redundant back-up designed monitoring device, the first CPU design to receive interference type fiber-optic gyro output parameter, through parcel then output; the second one CPU design to monitor interference type fiber-optic gyro's working state, at same time monitor the working state of first CPU, also can be used as communication backup of first CPU. Such monitoring device could real-time handle different kinds of working order of triaxiality fiber-optic gyro, and according to triaxiality fiber-optic gyro defined malfunction to process relative disposing, advance the reliability of monitoring device.