Video data storage method and system capable of supporting code stream switching

The invention discloses a video data storage method and system capable of supporting code stream switching. The method comprises the steps that after a trigger video instruction is received, whether an execution storage task exists or not is judged, when it is judged that the execution storage task exists, whether a first storage code stream of a new storage task corresponding to a newly received video task trigger instruction is higher than a second storage code stream of the execution storage task or not is judged, if yes, the rest execution time is calculated according to the executed time and video duration time in the execution storage task, and then a new storage task is executed after the video data in the next second in the execution storage task are received; if not, the rest execution time is calculated according to the executed time and video duration time of the execution storage task, then the execution storage task is continuously executed in the rest execution time, and the new storage task is