Cleaning robot and controlling method thereof

A cleaning robot comprising:

• a main body;
• a motion driver provided in the main body, and the motion driver configured to move the cleaning robot;
• a pad motor provided in the main body, the pad motor configured to rotate a pad provided on a lower surface of the main body;
• a humidity sensor provided around the pad and configured to detect humidity around the pad;
• a user interface configured to receive a user input;
• a communicator configured to communicate with a user terminal;
• and
• a controller configured to control an operation of the pad motor and an operation of the motion driver,
• wherein the controller configured to:
• set a reference humidity based on the user input received from the user interface or the user terminal;
• based on the detected humidity being lower than the reference humidity while the motion driver and the pad motor are operating, control the pad motor to stop rotating of the pad and control the motion driver to return the cleaning robot to a docking station.