In order to meet the needs of high-speed parallel processing of UWB signals in future electronic information systems, a coherent Optical Frequency Comb (OFC) generation method is proposed, which can be applied to UWB channel-processing.Based on nonlinear broadening effect, coherent OFC generation with high repetition rate and multiple combs can be realized, and the repetition rate and repetition rate difference can be tuned.The cascaded electro-optical modulator is used to generate the initial coherent optical comb.The seed comb selected by Wavelength Division Multiplexing (WDM) is injected and locked.The locked comb is replicated and broadened by the combination module of nonlinear, single-mode and dispersion flattened optical fiber.The coherent OFC with the repetition rate of 80 GHz and 79.4 GHz, the flatness of less than 3 dB and 20 combs is obtained, which can receive and process the UWB signals in Q/V band, and support the reception and processing of the RF signals with wide-band coverage and large instantaneous bandwidth in such applications as RF integration and large-capacity satellite communication.