A keyboard, comprising a bottom plate, a circuit board disposed on the bottom plate, and a plurality of keys disposed on a side that is of the circuit board and that is away from the bottom plate, wherein each key comprises a keycap, a rise-and-fall component connecting the keycap to the bottom plate, and an electronic ink screen fastened on a side that is of the keycap and that is away from the rise-and-fall component, wherein a first electric conductor connected to the electronic ink screen is disposed on the keycap, a second electric conductor is disposed on the rise-and-fall component, a third electric conductor is disposed on the bottom plate, a signal line used to supply power to the electronic ink screen is disposed on the circuit board, one end of the second electric conductor is electrically connected to the first electric conductor at a joint between the keycap and the rise-and-fall component, the other end of the second electric conductor is electrically connected to the third electric conductor at a joint between the rise-and-fall component and the bottom plate, and the third electric conductor is electrically connected to the signal line, characterized in that the rise-and-fall component comprises: a bracket that passes through a first avoidance hole disposed in the circuit board and that presses against the bottom plate, and a support cradle that is fastened to the keycap, wherein a sliding slot whose opening faces the keycap is disposed in the support cradle, the support cradle is slidingly assembled in the sliding slot, a first elastic part is disposed in the sliding slot, one end of the first elastic part presses against the circuit board, and the other end of the first elastic part presses against the support cradle, wherein the first electric conductor is a first via disposed in the keycap, the second electric conductor comprises a first metal layer disposed on an inner wall of the sliding slot and a second metal layer that is disposed on an outer wall of the support cradle and that is electrically connected to the first metal layer, an end that is of the first metal layer and that is close to the bottom plate is electrically connected to the third electric conductor, and an end that is of the second metal layer and that is close to the keycap is electrically connected to the first via. each key comprises a keycap, a rise-and-fall component connecting the keycap to the bottom plate, and an electronic ink screen fastened on a side that is of the keycap and that is away from the rise-and-fall component, wherein a first electric conductor connected to the electronic ink screen is disposed on the keycap, a second electric conductor is disposed on the rise-and-fall component, a third electric conductor is disposed on the bottom plate, a signal line used to supply power to the electronic ink screen is disposed on the circuit board, one end of the second electric conductor is electrically connected to the first electric conductor at a joint between the keycap and the rise-and-fall component, the other end of the second electric conductor is electrically connected to the third electric conductor at a joint between the rise-and-fall component and the bottom plate, and the third electric conductor is electrically connected to the signal line, characterized in that the rise-and-fall component comprises: a bracket that passes through a first avoidance hole disposed in the circuit board and that presses against the bottom plate, and a support cradle that is fastened to the keycap, wherein a sliding slot whose opening faces the keycap is disposed in the support cradle, the support cradle is slidingly assembled in the sliding slot, a first elastic part is disposed in the sliding slot, one end of the first elastic part presses against the circuit board, and the other end of the first elastic part presses against the support cradle, wherein the first electric conductor is a first via disposed in the keycap, the second electric conductor comprises a first metal layer disposed on an inner wall of the sliding slot and a second metal layer that is disposed on an outer wall of the support cradle and that is electrically connected to the first metal layer, an end that is of the first metal layer and that is close to the bottom plate is electrically connected to the third electric conductor, and an end that is of the second metal layer and that is close to the keycap is electrically connected to the first via.