Edge-to-center cleaning method used by robot cleaner

A cleaning method used by a robot cleaner for traversing an area to be cleaned comprising multiple rooms, and reducing repeated lines of travel, that is, an edge-to-center cleaning method used by a robot cleaner: the robot cleaner advances along an exterior wall in a room, and in the process, the robot cleaner leaves the exterior wall several times and moves in a direction away from the exterior wall to clean the floor. Each time the robot cleaner moves a certain distance away from the exterior wall or encounters an obstacle, the robot cleaner first rotates a preset angle, advances a preset distance, and then returns to the exterior wall, thus traversing and cleaning the area to-be-cleaned.