Wet robot cleaner and contamination prevention module used therefor

A contamination prevention module to prevent a wet cleaning module from being contaminated by a foreign substance, the wet cleaning module including a body that is movable on a surface to be cleaned and a rotational wet pad on a bottom of the body with a wettable surface to wet clean the surface, and the contamination prevention module comprising:

• a coupling body configured to be detachably coupled to the body of the wet cleaning module;
• an electrostatic adsorption pad arranged on a bottom of the coupling body;
• and
• a foreign substance barrier wall arranged on a bottom of the coupling body,
• wherein, the contamination prevention module is configured so that, while the coupling body is coupled to the body of the wet cleaning module:
• the electrostatic adsorption pad is located in front of the rotational wet pad and configured to electrostatically adsorb a foreign substance on the surface under the electrostatic adsorption pad, and
• the foreign substance barrier is arranged between the rotational wet pad and the electrostatic adsorption pad to prevent the foreign substance adsorbed on the electrostatic adsorption pad from moving to the rotational wet pad.