To provide a first-in first-out buffer system as a buffer system for temporarily storing a plurality of boards.

This first-in first-out buffer system comprises at least one buffer layer formed by a shaft and a roller to be inserted and fixed on the shaft to temporarily store or transfer a board, an rising and descending transfer module for connecting a buffer layer having a board to be transferred by moving the buffer layer upward or downward to a driving module, and the driving module for rotating the shaft of the buffer layer having the board to be transferred for board transfer.