Embodiments of this disclosure provide a beam failure recovery method in a multi-carrier system and an apparatus, and relate to the field of communications technologies. The method is applied to UE and includes: when determining that a beam failure event occurs on a carrier corresponding to a first cell and a condition for triggering sending of a beam failure recovery request is met, sending a first beam failure recovery request message to a network-side device by using a first resource, where the first beam failure recovery request message includes first indication information, and the first indication information is used to indicate the first cell; and receiving a beam failure recovery request response message from the network-side device.