The embodiment of the invention provides an audio-video file download method and system. The method comprises: receiving the audio-video file information from a first terminal, wherein the audio-video file information includes the update information of the audio-video file; setting the obtaining clock of the audio-video file according to the update information of the audio-video file; and downloading the updated audio-video file according to the obtaining clock. According to the embodiment, the audio-video file download method and system do not need manual intervention so as to save the time of episode tracking operation and avoid missing the update opportunity of the episodes.