A method, an apparatus, and a device for transmitting a control channel are disclosed. The method includes: generating at least one eCCE, and transmitting the control channel through the at least one eCCE, where a process of generating each eCCE specifically includes: determining at least two physical resource block (PRB) pairs for transmitting the control channel, where each PRB pair of the at least two PRB pairs correspond to multiple enhanced resource element groups eREGs and the multiple eREGs have eREG attribute information that is not exactly the same; and selecting each eREG from the multiple eREGs corresponding to each PRB pair, where the selected eREGs have different eREG attribute information, and forming an eCCE with the selected eREGs. Embodiments of the present invention are applied to implement generation of an eCCE according to an eREG, so as to transmit an enhanced control channel through the eCCE.