Embodiments of the invention disclose a money box, a financial self-service device, and a banknote collection method. The body of the money box is a box body, the top of the box body is provided with an inlet, and a banknote collection mechanism is arranged inside the inlet. The banknote collection mechanism comprises a drive shaft which is arranged at the inlet, a base roller which sleeves the drive shaft and of which the diameters of the two ends are greater than the diameter of the middle, a friction roller which fixedly sleeves the middle of the base roller, and a driven roller which is arranged opposite to the friction roller and spaced apart from the friction roller at a predetermined distance for banknote conveying. According to the embodiments of the invention, a banknote is squeezed into a wavy shape when collected, so that the friction between the banknote collection mechanism and the banknote is increased, and the probability of banknote jam due to banknote sliding and inclining is reduced.