A dual-cavity stable control scheme for regenerative mode-locking fiber laser is proposed. The scheme uses phase-locked loop to detect the microwave frequency drift caused by cavity length change of resonant cavity and realizes feedback compensation with piezoelectric ceramic. We use a microwave mixer to compare the phases of two microwave signals with the same frequency in photoelectric regenerative chamber. Cavity change is obtained and compensated by phase shifter. In this study, the regenerative mode-locking fiber laser outputs optical pulses with repetition frequency of 10 GHz and pulse width of 16.6 ps. The optoelectronic regenerative cavity outputs microwave signal with repetition frequency of 10 GHz,side-mode suppression ratio of 40 dB, phase noise of -127 dBc/Hz and the frequency shift smaller than 1 Hz in 70 min. Compared with the present regenerative mode-locking scheme, the proposed scheme can control cavity lengths of optical resonator and optoelectronic regenerative cavity simultaneously, and can output microwave signal with stable frequency and high quality pulse. The regenerative mode-locking fiber laser can work stably for a long time.