An artificial intelligence robot cleaner is provided. The artificial intelligence robot cleaner includes a driving unit configured to drive the artificial intelligence robot cleaner, a cleaning unit configured to remove contaminant, a rear camera configured to photograph a rear area of the artificial intelligence robot cleaner, and a processor configured to determine whether cleaning of an already cleaned area is completed by using the image of the rear area of the artificial intelligence robot cleaner, and if the cleaning is not completed, control the driving unit and the cleaning unit to reclean the area where the cleaning is not completed.