A waterway switching device, comprising: a body having a hollow portion and a water inlet end and a water outlet end, in which at least two waterways in communication with the hollow portion are provided at the water outlet end; a switching shaft disposed in the body and comprising a water-division section located in the hollow portion and a traction section extending out of the water outlet end; and a driving mechanism disposed outside the body and configured to drive the switching shaft to reciprocate in an axial direction, such that the switching shaft is switched between at least two switching positions, wherein at least one waterway is opened correspondingly at each of the switching positions; the driving mechanism comprising a driving member and a one-way rotational device for connecting the driving member to the switching shaft, wherein the waterway switching device further comprises a reciprocating moving part, and the driving member is connected to the one-way rotational device by the reciprocating moving part, wherein the one-way rotational device comprises: a driving wheel that is connected to the reciprocating moving part and configured to be swung by driving of the reciprocating moving part, and an active ratchet being provided on a lower surface of the driving wheel; and a driven wheel disposed under the driving wheel, and a driven ratchet engaged with the active ratchet being disposed on an upper surface of the driven wheel, such that the driven wheel is configured to rotate in one direction along with the rotation of the driving wheel, thereby driving the switching shaft to reciprocate, wherein the waterway switching device further comprises a linkage member for connecting the one-way rotational device and the traction section, the linkage member comprises: a top end portion disposed under the driven wheel, in which a traction groove is defined in the top end portion, and a driven deadbolt protruded and fitted into the traction groove provided on a lower surface of the driven wheel; and the driven wheel is configured to drive the linkage member to reciprocate by cooperation of the driven deadbolt and the traction groove; and a connecting portion connected to the top end portion and the traction section. a body having a hollow portion and a water inlet end and a water outlet end, in which at least two waterways in communication with the hollow portion are provided at the water outlet end; a switching shaft disposed in the body and comprising a water-division section located in the hollow portion and a traction section extending out of the water outlet end; and a driving mechanism disposed outside the body and configured to drive the switching shaft to reciprocate in an axial direction, such that the switching shaft is switched between at least two switching positions, wherein at least one waterway is opened correspondingly at each of the switching positions; the driving mechanism comprising a driving member and a one-way rotational device for connecting the driving member to the switching shaft, wherein the waterway switching device further comprises a reciprocating moving part, and the driving member is connected to the one-way rotational device by the reciprocating moving part, wherein the one-way rotational device comprises: a driving wheel that is connected to the reciprocating moving part and configured to be swung by driving of the reciprocating moving part, and an active ratchet being provided on a lower surface of the driving wheel; and a driven wheel disposed under the driving wheel, and a driven ratchet engaged with the active ratchet being disposed on an upper surface of the driven wheel, such that the driven wheel is configured to rotate in one direction along with the rotation of the driving wheel, thereby driving the switching shaft to reciprocate, a driving wheel that is connected to the reciprocating moving part and configured to be swung by driving of the reciprocating moving part, and an active ratchet being provided on a lower surface of the driving wheel; and a driven wheel disposed under the driving wheel, and a driven ratchet engaged with the active ratchet being disposed on an upper surface of the driven wheel, such that the driven wheel is configured to rotate in one direction along with the rotation of the driving wheel, thereby driving the switching shaft to reciprocate, wherein the waterway switching device further comprises a linkage member for connecting the one-way rotational device and the traction section, the linkage member comprises: a top end portion disposed under the driven wheel, in which a traction groove is defined in the top end portion, and a driven deadbolt protruded and fitted into the traction groove provided on a lower surface of the driven wheel; and the driven wheel is configured to drive the linkage member to reciprocate by cooperation of the driven deadbolt and the traction groove; and a connecting portion connected to the top end portion and the traction section. a top end portion disposed under the driven wheel, in which a traction groove is defined in the top end portion, and a driven deadbolt protruded and fitted into the traction groove provided on a lower surface of the driven wheel; and the driven wheel is configured to drive the linkage member to reciprocate by cooperation of the driven deadbolt and the traction groove; and a connecting portion connected to the top end portion and the traction section.