The function, inner framework and work principle of the signal processor were analyzed based on frequency-modulated continuous-wave radar. The processing circuit of the signal processor was designed by using DSP and FPGA chips as the core part, and the pipeline was built to process data. The FPGA, controlled by the DSP, managed the low peripherals and customized the FIFO data buffer inside; The DSP processed the sampled data and computed the moving target parameter. It has been proved that the signal processor design has the advantage of high speed, real-time processing, and stable working, at same time, can been widely used in ground moving target detection.