Full-digital portable optical comb frequency locking method and system

The invention discloses a full-digital portable optical comb frequency locking method and system, and the system comprises a digital phase extraction module which is in communication connection with a first ADC module, a second ADC module, a frequency extraction module, and a high-precision frequency generator. The frequency extraction module is in communication connection with the digital-to-analog conversion and processing module and the feedback command real-time correction module; the high-stability reference source is in signal connection with the first ADC module and is in communication connection with the high-precision frequency generator; the second ADC module is in communication connection with a photoelectric conversion and preprocessing module, the photoelectric conversion and preprocessing module is in communication connection with an optical comb generation and feedback control module, and the optical comb generation and feedback control module is in signal connection with a digital-analog conve