The present invention relates to a method and device for processing carrier aggregation capability, which method comprises: sending, by user equipment, its own carrier aggregation capability to the network side; acquiring, by network side equipment, the carrier aggregation capability of the user equipment; and configuring, by the network side equipment, aggregated carriers for the user equipment according to the carrier aggregation capability thereof. In the present invention, the sending of the carrier aggregation capability to the network side by the UE enables the network side to acquire the UE's carrier aggregation capability, thus ensuring the normal operation of the carrier aggregation system.