A method of dividing a coverage area of a robot and a device for the same. That is, a method of producing a space map for a robot to work and dividing the space map into at least one segment and a device for the same. The method includes producing an occupancy grid map composed of grid points that are probabilistically distributed by sensing a distance from an obstacle, producing a configuration space map by increasing the thickness of an obstacle and a wall in the occupancy grid map on the basis of the radius and size of the robot, and dividing an area by sweeping the area with a band-typed slice in the configuration space map.