Aiming at the dynamic routing characteristic of distributed satellite network, a wavelength-preserving all-optical regenerative scheme based on two-stage offset filtering is put forward. By using the property that the signs of chirp induced by self-phase modulation (SPM) are opposite in semiconductor optical amplifier (SOA) and high nonlinear fiber, a red-shifted filtering and a blue-shifted filtering are done respectively on the signals after the SOA and the HNLF, which not only realizes a two-stage regeneration of signals, but also compensates the frequency offset and keeps the wavelength unchanging before and after the regenerator. Meanwhile, the scheme is of simple structure, small volume and light quality, which can satisfy the limitation of satellite to the payloads. The result shows that the Q factor of signals can be improved more than 1.5 dB, and the bit error rate (BER) can be reduced more than one order of magnitude compared with the result of one-stage regenerator.