A banknote temporary storage unit of a banknote processing device includes a box body, and further includes a controllable telescopic rod having one end configured to be fixed at a transaction port of the banknote processing device and a telescopic end articulated to the box body. The box body is slidably arranged at the transaction port, and in the case that the controllable telescopic rod is at a terminal of a telescoping stroke of the controllable telescopic rod, the box body is located outside the transaction port, and a banknote dispensing space in the box body is in a visible area.