Due to the high resonance frequency of the multi-ring resonant micro-mechanical gyro, the traditional digital control circuit can not accurately balance the accuracy and tracking speed of the gyro amplitude signal. Based on the traditional hemispherical gyro digital control loop, a frequency tracking circuit is proposed for multi-ring resonant micro-mechanical gyroscopes, and it is applied to multi-ring resonant micro-mechanical gyros for the first time. The circuit is based on a high-speed A/D conversion circuit. The frequency and phase information is calculated by high-speed sampling of the amplitude signal, and the output signal is generated by the CORDIC algorithm. Test results show that the circuit makes the frequency tracking accuracy of the multi-ring resonant micro-mechanical gyro amplitude signal reach 0.78Hz, and the frequency tracking time is less than 40μs, which greatly improves the performance of the control circuit.