The invention relates to the technical field of spinning, in particular to a wetting device for compact spinning yarns. The wetting device comprises a water storage tank, a wetting cover, a connectingpipe, a water pump, a water conveying pipe, a water distribution pipe, a branch pipe, an atomizing nozzle, a strip-shaped opening and a mist blocking assembly; a circuit of the water pump is closed,the water pump works to convey water in the water storage tank into the water distribution pipe through the connecting pipe and the water conveying pipe, the water in the water distribution pipe formsmist through the atomizing nozzle on the branch pipe and is sprayed into the wetting cover, and therefore yarns passing through the wetting cover are humidified; and when the yarns are inserted, theyarns penetrate through the mist blocking assembly, the mist blocking assembly is installed in the strip-shaped opening, under blocking of the mist blocking assembly, atomized water mist in the wetting cover is prevented from drifting into a working environment, and water resources are saved.