Provided are an information transmission method and device. The method includes that a base station configures, in multiplexing downlink control information (DCI), instruction information for instructing a user equipment (UE) that includes different types to act; and the base station sends the multiplexing DCI to the UE. The multiplexing DCI is DCI that multiplexes DCI of a physical downlink shared channel (PDSCH), and the multiplexing DCI is the DCI of the PDSCH in response to being scrambled by a preset radio network temporary identifier (RNTI) and is paging DCI in response to being scrambled by a paging radio network temporary identifier (P-RNTI), where the preset RNTI is an RNTI excluding the P-RNTI. Instruction information is set in multiplexing DCI to instruct a UE that includes different types to act to switch a paging mechanism.