A sheet-type medium stacking device, comprising: a piece-by-piece sheet-type medium conveying mechanism configured to convey a sheet-type medium piece by piece; an upper conveyor belt configured to provide a driving force to the sheet-type medium and arranged around a driving transmission shaft and a driven transmission shaft which are arranged in a conveying direction of the sheet-type medium; an arc-shaped stacking plate configured to support the sheet-type medium, wherein an arc-shaped surface, fitting closely to the upper conveyor belt, of the arc-shaped stacking plate defines a conveying passage for the sheet-type medium, a length of the conveying passage is at least greater than a length of one sheet of the sheet-type medium in the conveying direction, and one end of the conveying passage abuts the piece-by-piece sheet-type medium conveying mechanism and is slightly lower than a delivering outlet of the conveying mechanism, and another end of the conveying passage forms a discharging outlet for a whole stack of sheet-type medium; a movable blocking mechanism arranged on a section of the conveying passage close to the discharging outlet and configured to selectively block the sheet-type medium; a sensor device arranged at a tail end of the delivering outlet of the piece-by-piece sheet-type medium conveying mechanism and configured to detect the arrival and passing of a sheet of the sheet-type medium; and a control unit configured to control the upper conveyor belt to move or stop moving according to information feedback from the sensor device; characterized in that, at least one pair of convex ribs (183, 184) are formed on a section, close to the conveying mechanism of the arc-shaped surface of the arc-shaped stacking plate at two sides of the upper conveyor belt, and a distance between the pair of convex ribs (183, 184) is smaller than the minimum dimension of the sheet-type medium in a direction perpendicular to the conveying direction. a piece-by-piece sheet-type medium conveying mechanism configured to convey a sheet-type medium piece by piece; an upper conveyor belt configured to provide a driving force to the sheet-type medium and arranged around a driving transmission shaft and a driven transmission shaft which are arranged in a conveying direction of the sheet-type medium; an arc-shaped stacking plate configured to support the sheet-type medium, wherein an arc-shaped surface, fitting closely to the upper conveyor belt, of the arc-shaped stacking plate defines a conveying passage for the sheet-type medium, a length of the conveying passage is at least greater than a length of one sheet of the sheet-type medium in the conveying direction, and one end of the conveying passage abuts the piece-by-piece sheet-type medium conveying mechanism and is slightly lower than a delivering outlet of the conveying mechanism, and another end of the conveying passage forms a discharging outlet for a whole stack of sheet-type medium; a movable blocking mechanism arranged on a section of the conveying passage close to the discharging outlet and configured to selectively block the sheet-type medium; a sensor device arranged at a tail end of the delivering outlet of the piece-by-piece sheet-type medium conveying mechanism and configured to detect the arrival and passing of a sheet of the sheet-type medium; and a control unit configured to control the upper conveyor belt to move or stop moving according to information feedback from the sensor device; characterized in that,