Disclosed are a method and a device for detecting a fault in a synchronization link. The method includes: setting one or more reference nodes corresponding to a node to be detected (101); when the node to be detected starts a detection function, acquiring reference time from the one or more reference nodes and acquiring synchronization time from a synchronization path (102); and determining, by the node to be detected, whether there is a fault in the synchronization link between the node to be detected and a Grandmaster Clock (GM) node by using all the reference time and the synchronization time (103).