A method for transmitting feedback information includes receiving, by a terminal device, trigger signaling used for triggering transmission of feedback information for a plurality of downlink channel groups by the terminal device, wherein the plurality of downlink channel groups comprise a first downlink channel group and a second downlink channel group, and a group number of the first downlink channel group is smaller than a group number of the second downlink channel group; and generating, by the terminal device based on the trigger signaling, a feedback codebook comprising the feedback information for the plurality of downlink channel groups, wherein the feedback information corresponding to the second downlink channel group is appended to the feedback information corresponding to the first downlink channel group in the feedback codebook.