Disclosed in the present application are a radio link monitoring method and apparatus, the method comprising: when a UE performs radio link monitoring, the UE monitors a downlink signal of a primary serving cell to obtain monitoring results; and the UE compares the monitoring results with an required synchronization threshold to determine whether the UE is in a synchronized state; the synchronization threshold is determined on the basis of preset parameters. The present invention solves the problems in the prior art of the complexity of defining RLM performance requirements, and being unable to provide the needed flexibility for supporting different specific systems by means of adjusting thresholds.