Provided is a link communication method capable of responding to faults rapidly on the basis of a chained converter. A distributed structure and convenient optical fiber communication interfaces of the chained converter are utilized by a system to achieve point-to-point link communication between local control execution units and a chained converter controller. Optical fiber serial ports of the chained converter are adopted as the communication interfaces of the local control execution units and the chained converter, transmission of link control messages, constant value messages and upgrade messages can be carried out flexibly with the chained converter, and all the local control execution units can be locked rapidly when any node breaks down. 8B/10B coding and decoding are adopted by communication methods of each pair of optical fiber serial ports, and normal communication is guaranteed through assistance of CRC. The link communication method capable of responding to the faults rapidly on the basis of the chained converter fully meets the current requirements of communication among nodes, synchronous control among the nodes and rapid response to faults of the chained converter, has good generality, and greatly improves the stability and reliability of communication among the nodes of the chained converter.