The invention discloses a pre-wetting nozzle for a smart toilet. The pre-wetting nozzle comprises a pipe body, a water inlet formed in one end of the pipe body, a water outlet formed in the other endof the pipe body, a rotating piece arranged in the pipe body in a manner of rotating about an own axis and used for separating the water inlet from the water outlet, a first through hole formed in therotating piece for communicating the water inlet with the water outlet, a second through arranged between an outer peripheral part of the rotating piece and an inner peripheral part of the pipe bodyand communicated with the water inlet, and a flow guiding groove arranged in one end of the rotating piece close to the water outlet, wherein the flow guiding groove is respectively communicated withthe second through hole and the water outlet for guiding water flowing out of the second through hole to the water outlet and driving the rotating piece to rotate about the own axis. The pre-wetting nozzle for the smart toilet provided by the invention consumes less water and has a relatively good cleaning effect due to the water flows outward under action of rotational centrifugal force and collides with each other to form misty water flow for pre-wetting the toilet.