A new compressed sampling digital receiver based on polyphase MWC structure was proposed to intercept wideband IF(intermediate frequency) signal. The new receiver structure includes three modules:serial parallel conversion, parallel multiplication and polyphase filtering. With the same multiplier resources, the working rate of the new receiver structure is much lower than that of the existing MWC structure. Simulation result verifies the correctness of this new structure. The design lays a foundation for the physical realization of the MWC discrete compressed sampling digital receiver on the FPGA(field programmable gate array) and makes the whole receiver structure more practical in engineering application.