A linkage device, comprising: a banknote stacking plate, a cover plate, a transmission mechanism, and a driving mechanism, wherein, a first transmission component is mounted on the banknote stacking plate and configured to drive the banknote stacking plate to rotate; a second transmission component and a spring are mounted on the cover plate, and the second transmission component is configured to drive the cover plate to rotate; a torque limiter is mounted on the first transmission component; a one-way bearing is mounted on the second transmission component; the transmission mechanism is mounted between the first transmission component and the second transmission component, and is configured to provide a medium for a transmission between the first transmission component and the second transmission component; the driving mechanism is configured to provide a rotation power to the first transmission component; the banknote stacking plate, after rotating by a certain angle to cover a banknote separating mechanism under the action of a rotation power provided by the driving mechanism, is maintained under the protection of the torque limiter, and the cover plate continues to rotate by a certain angle to cover an impeller wheel type banknote stacking mechanism under the action of a transmission force provided by the transmission mechanism; and the banknote stacking plate, after reversely rotating by a certain angle to uncover the banknote separating mechanism under the action of a reverse rotation power provided by the driving mechanism, is maintained under the protection of the torque limiter, and the one-way bearing releases the action on a shaft due to the reverse rotation of the transmission mechanism, and the cover plate reversely rotates by a certain angle to uncover the impeller wheel type banknote stacking mechanism under the action of the spring. a banknote stacking plate, a cover plate, a transmission mechanism, and a driving mechanism, wherein, a first transmission component is mounted on the banknote stacking plate and configured to drive the banknote stacking plate to rotate; a second transmission component and a spring are mounted on the cover plate, and the second transmission component is configured to drive the cover plate to rotate; a torque limiter is mounted on the first transmission component; a one-way bearing is mounted on the second transmission component; the transmission mechanism is mounted between the first transmission component and the second transmission component, and is configured to provide a medium for a transmission between the first transmission component and the second transmission component; the driving mechanism is configured to provide a rotation power to the first transmission component; the banknote stacking plate, after rotating by a certain angle to cover a banknote separating mechanism under the action of a rotation power provided by the driving mechanism, is maintained under the protection of the torque limiter, and the cover plate continues to rotate by a certain angle to cover an impeller wheel type banknote stacking mechanism under the action of a transmission force provided by the transmission mechanism; and the banknote stacking plate, after reversely rotating by a certain angle to uncover the banknote separating mechanism under the action of a reverse rotation power provided by the driving mechanism, is maintained under the protection of the torque limiter, and the one-way bearing releases the action on a shaft due to the reverse rotation of the transmission mechanism, and the cover plate reversely rotates by a certain angle to uncover the impeller wheel type banknote stacking mechanism under the action of the spring.