A method and a device for allocating a Control Channel Element (CCE) are provided by the present invention. The method comprises: determining a CCE aggregation level, by a network, according to a mapping relationship between a Channel Quality Identity (CQI) and a Physical Downlink Control Channel (PDCCH) code rate; and allocating the CCE resource according to the CCE aggregation level by the network. By the method, the effect of improving the utilization rate of the CCE resource is achieved.