In order to reduce the incidence of traffic accidents, this paper designs a radar back-end circuit scheme based on field editable gate array. This paper describes the main functions of radar back-end circuit, decomposes the radar back-end circuit, analyzes the signal acquisition circuit FPGA circuit power circuit DDS circuit, realizes the design of millimeter-wave radar back-end digital processing board, and carries out field test through vehicles. The test results show that the system can improve the real-time performance of radar detection and ensure the safety of drivers.