A method for transmitting feedback information, comprising: receiving, by a terminal device, trigger signaling from a network device, wherein the trigger signaling is used for triggering the terminal device to send feedback information to the network device; and determining, by the terminal device, to send a first feedback information codebook or a second feedback information codebook according to the trigger signaling, wherein the first feedback information codebook comprises feedback information corresponding to at least one downlink transmission channel indicated by the trigger signaling, wherein the trigger signaling is used for indicating at least one downlink transmission channel group, the first feedback information codebook is determined by the terminal device according to the trigger signaling, and the at least one downlink transmission channel group comprises the at least one downlink transmission channel, wherein the trigger signaling comprises a first information field and the first information field is 1-bit length field, and determining, by the terminal device, to send the first feedback information codebook or the second feedback information codebook according to the trigger signaling comprises: determining, by the terminal device, to send the first feedback information codebook if the first information field is a first preset value; or determining, by the terminal device, to send the second feedback information codebook if the first information field is a second preset value; wherein the trigger signaling further comprises a second information field different from the first information field, and if the first information field is the first preset value, the second information field is used for indicating the at least one downlink transmission channel group, and wherein the second feedback information codebook is determined by the terminal device according to the maximum number of configurable HARQ processes, wherein the maximum number is configured by the network device, and the second feedback information codebook comprises feedback information corresponding to all HARQ processes configured by the network device sending, by the terminal device, the first feedback information codebook or the second feedback information codebook to the network device. receiving, by a terminal device, trigger signaling from a network device, wherein the trigger signaling is used for triggering the terminal device to send feedback information to the network device; and determining, by the terminal device, to send a first feedback information codebook or a second feedback information codebook according to the trigger signaling, wherein the first feedback information codebook comprises feedback information corresponding to at least one downlink transmission channel indicated by the trigger signaling, wherein the trigger signaling is used for indicating at least one downlink transmission channel group, the first feedback information codebook is determined by the terminal device according to the trigger signaling, and the at least one downlink transmission channel group comprises the at least one downlink transmission channel, wherein the trigger signaling comprises a first information field and the first information field is 1-bit length field, and determining, by the terminal device, to send the first feedback information codebook or the second feedback information codebook according to the trigger signaling comprises: determining, by the terminal device, to send the first feedback information codebook if the first information field is a first preset value; or determining, by the terminal device, to send the second feedback information codebook if the first information field is a second preset value; wherein the trigger signaling further comprises a second information field different from the first information field, and if the first information field is the first preset value, the second information field is used for indicating the at least one downlink transmission channel group, and wherein the second feedback information codebook is determined by the terminal device according to the maximum number of configurable HARQ processes, wherein the maximum number is configured by the network device, and the second feedback information codebook comprises feedback information corresponding to all HARQ processes configured by the network device sending, by the terminal device, the first feedback information codebook or the second feedback information codebook to the network device. determining, by the terminal device, to send the first feedback information codebook if the first information field is a first preset value; or determining, by the terminal device, to send the second feedback information codebook if the first information field is a second preset value; wherein the trigger signaling further comprises a second information field different from the first information field, and if the first information field is the first preset value, the second information field is used for indicating the at least one downlink transmission channel group, and wherein the second feedback information codebook is determined by the terminal device according to the maximum number of configurable HARQ processes, wherein the maximum number is configured by the network device, and the second feedback information codebook comprises feedback information corresponding to all HARQ processes configured by the network device sending, by the terminal device, the first feedback information codebook or the second feedback information codebook to the network device.