A wet type dust collecting apparatus of a vacuum cleaner is provided. The wet type dust collecting apparatus of a vacuum cleaner includes a first separating unit configured to filter out and discharge dust by rotating air which is inlet via a first air inlet, and a plurality of a second centrifugal separating units configured to filter out dust from the air which is discharged from the first separating unit, and configured to eliminate dust from the inlet air via water which is filled inside of the second centrifugal separating units.