The present disclosure relates to audio data transmission methods and apparatuses. In one example method, a sending apparatus obtains first formatted bitstream data corresponding to a common component of at least one channel of audio data, and obtains at least one channel of second formatted bitstream data corresponding to the at least one channel of audio data. The at least one channel of second formatted bitstream data is obtained based on the at least one channel of audio data and the common component. The sending apparatus sends the first formatted bitstream data and the at least one channel of second formatted bitstream data.