The invention discloses a bill recycling mechanism, which includes a box body, provided with a bill outlet; a bill tray, including a first door and a second door, which are oppositely arranged, and used for receiving and guiding bills to the bill outlet; and a double door driving assembly, used for driving the first door and the second door to be opened or closed, wherein the first door and the second door are pivotally opened and pivoted into a bill storage space below the first door and the second door. According to the bill recycling mechanism, the bills directly fall into the bill storage space below the double doors when the first door and the second door are opened, so that a bill recycling speed is increased.