The invention discloses a jitter buffer, a data storage method and device, and a data reading method and device. The jitter buffer comprises one or more data link tables for storing data, and annular data indexes including a plurality of data indexes being annularly arranged in sequence, wherein an initial position of the annular data indexes can be set; and each data link table corresponds to one data index. Annular array indexes are added on a link table buffer structure, and the traversing speed can be increased to shorten data inserting and reading times, thereby increasing the buffering efficiency.