A photonic approach to implement a microwave channelized receiver based on superimposed chirped fiber Bragg grating (S-CFBG) is proposed. An optical frequency comb (OFC) is generated using the first S-CFBG. Broadband microwave signal is multicast by the OFC, spectrally sliced by the second S-CFBG and channelized by optical wavelength division multiplexer (WDM) de-mux. Broadband microwave signal with frequency measurement range form 0 to 20 GHz and accuracy of 0.5 GHz is achieved by simulation. 156.25 Mbit/s non-return-to-zero (NRZ) signals, which are located at different radio frequency (RF) carrier waves, can be detected simultaneously and instantaneously without local RF source array. The bite error rate (BER) performance of receiver is researched.