Coin changing system

The invention discloses a coin changing system. A unique and concise light path is designed. Under the premise that the array mode of containing modules is not limited, the coin changing system detects storage amount of coins of the containing modules arrayed in a two-transverse-and-two-longitudinal mode or an original mode. Further, a unique guide element of the coin changing system is helpful to reducing chances of coin being stuck when coins fall into the containing modules. The coin changing system comprises a coin poking system which uses a single motor to poke coins of a plurality of containing modules so as to contract the size of the coin changing system. The coin changing system simplifies the design of the system and solves the problems existing in the prior art for long time.