A water outflow device, comprising: a shell; a movable plate; and a driving mechanism, characterized in that: the shell comprises a water outflow part, the water outflow part comprises at least one water outlet, each of the at least one water outlet comprises a first inner sidewall, the driving mechanism is connected to the movable plate to drive the movable plate to move repeatedly between a first position and a second position in a moving direction, wherein the moving direction is up and down, a distance between the movable plate and the at least one water outlet when the movable plate is in the first position is less than the distance between the movable plate and the at least one water outlet when the movable plate is in the second position, the movable plate comprises at least one insertion part fixedly disposed on the movable plate, each of the at least one insertion part comprises a first outer sidewall, each of the at least one insertion part is inserted into a corresponding one of the at least one water outlet, when the movable plate is located in the first position, a water outflow angle formed by the water outflow part is S1, when the movable plate is located in the second position, the water outflow angle formed by the water outflow part is S2, and the S1 and the S2 are different. a shell; a movable plate; and a driving mechanism, characterized in that: the shell comprises a water outflow part, the water outflow part comprises at least one water outlet, each of the at least one water outlet comprises a first inner sidewall, the driving mechanism is connected to the movable plate to drive the movable plate to move repeatedly between a first position and a second position in a moving direction, wherein the moving direction is up and down, a distance between the movable plate and the at least one water outlet when the movable plate is in the first position is less than the distance between the movable plate and the at least one water outlet when the movable plate is in the second position, the movable plate comprises at least one insertion part fixedly disposed on the movable plate, each of the at least one insertion part comprises a first outer sidewall, each of the at least one insertion part is inserted into a corresponding one of the at least one water outlet, when the movable plate is located in the first position, a water outflow angle formed by the water outflow part is S1, when the movable plate is located in the second position, the water outflow angle formed by the water outflow part is S2, and the S1 and the S2 are different. the shell comprises a water outflow part, the water outflow part comprises at least one water outlet, each of the at least one water outlet comprises a first inner sidewall, the driving mechanism is connected to the movable plate to drive the movable plate to move repeatedly between a first position and a second position in a moving direction, wherein the moving direction is up and down, a distance between the movable plate and the at least one water outlet when the movable plate is in the first position is less than the distance between the movable plate and the at least one water outlet when the movable plate is in the second position, the movable plate comprises at least one insertion part fixedly disposed on the movable plate, each of the at least one insertion part comprises a first outer sidewall, each of the at least one insertion part is inserted into a corresponding one of the at least one water outlet, when the movable plate is located in the first position, a water outflow angle formed by the water outflow part is S1, when the movable plate is located in the second position, the water outflow angle formed by the water outflow part is S2, and the S1 and the S2 are different.