Disclosed is a wet duster module for a cleaner including: a water supply nozzle for discharging water from the water tank to the duster, and the water supply nozzle includes: a nozzle body having a water outlet for discharging water to the duster at one end thereof, and as the water outlet is formed to be inclined, waterdrops forming on and blocking the water outlet may be prevented and clogging the water outlet with foreign substances contained in the waterdrops, as the formed waterdrops are dried up, may be prevented.