The invention discloses a method for transmitting a digital audio-video parameter set. The method comprises the following steps: in the process of sending each received circuit of an audio-video code stream by the broadcast sending end, the parameter set and corresponding audio-video data are separated; and before the audio-video data with the same parameter set is sent in each multiplexing subframe, the same parameter set is sent to the broadcast receiving end. The same parameter set is multiplexed in a multiplexing block or an audio-video data unit; and if the parameter set is changed compared with the prior parameter set, the changed same parameter set is sent to the broadcast receiving end to indicate that the parameter set is changed. The method is applied to avoid repeated transmission of the same parameter set, can effectively utilize bandwidth, well solve the problem of real-time parameter transmission, can rapidly and randomly access a user and bring no extra influence on a continuously-watching user.