Presented is a method for detecting link quality and a terminal device. The method includes that: a terminal device receives a first event reported by a first protocol layer in a second protocol layer, the first event being configured to indicate that quality of a signal in a first signal set is poor enough to meet a first condition; and the terminal device determines that a second event occurs in the second protocol layer based on the first event, the second event being configured to indicate that quality of a link corresponding to the signal in the first signal set is poor enough to meet a second condition. The method and terminal device are favorable for improving signal transmission performance.