A method and device for transmitting information are provided. The method includes: querying a corresponding second QoS flow identifier and a length of the second QoS flow identifier from stored configuration information in accordance with a first QoS flow identifier of data to be transmitted, where the configuration information includes a configuration list corresponding to a data bearer, the configuration list is configured to store a correspondence relationship among the first QoS flow identifier, the second QoS flow identifier and the length of the second QoS flow identifier, and the length of the second QoS flow identifier is smaller than a length of the first QoS flow identifier; and adding the second QoS flow identifier into a packet header of the data and implementing information transmission based on data obtained after addition when the second QoS flow identifier and the length of the second QoS flow identifier are queried.