The invention discloses a resonance optic gyro based on digital phase oblique wave frequency shift technology. The resonance optic gyro comprises an optical system composed of a tunable laser, an optical shunt, two phase demodulators, an optical resonance cavity and a photoelectric conversion module, and a processing circuit composed of two demodulation modules, two modulation signal generator modules, a frequency shift feedback control module and a feedback locking module, wherein a first signal extracted by the first demodulation module is controlled by the feedback locking module to adjust the central frequency of the tunable laser, and a second signal extracted by the second demodulation module is subjected to second frequency locking by the frequency shift feedback control module; and the output of the frequency shift feedback control module serves as the rotation output of the gyro. According to the invention, a resonance optic gyro structure is constructed, the digital phase oblique wave frequency shift technology is adopted in a second closed loop of the resonance optic gyro structure, the resonance optic gyro structure is favorable for miniaturization and integration of a system, improving the linearity and increasing the dynamic range of the system, and reducing reciprocity noise in the system.