The invention provides a method for realizing design and FPGA of a link detection circuit in a node interconnection system. The influence of an interconnection CPU structure on physical characteristics of a transmission link is fully considered, a method for implementing an analog circuit is adopted, the voltage swing characteristics of link transmission is configured, and the detection of the interconnection CPU transmission link is realized. The design principle and structure implementation in the implementation process comprise the principle implementation of a detection circuit at a transmitting end, the principle implementation of a detection circuit at a receiving end, the principle simulation verification of the detection circuit, the FPGA implementation of the detection circuit, FPGA debugging of the detection circuit, and FPGA platform hardware link fault setting and debugging.