The signal processing of Ultra-Wide Band (UWB) radar is a multi-task and compute-intensive procedure，so parallel multiprocessor technology must be employed to finish the procedure efficiently. This paper thoroughly analyzes the features of UWB radar real-time signal processing system. Based on the comparison between the advantages and disadvantages of various multiprocessor systems，a reconfigurable UWB radar real-time signal processing system architecture is proposed. The application of this architecture to practical systems shows its good performance，reconfigurability and flexibility.