Abstract: Embodiments of the present application relate to the technical field of smart home. Disclosed are a map data updating method, an apparatus, and a cleaning system. According to the map data updating method, map data change summary information can be determined on the basis of current map data information and cached map data information, and the map data change summary information can be sent; when receiving the map data change summary information, a mobile terminal can learn which map data of smart home devices has changed; the mobile terminal can send map data updating request information; and changed map data can be sent to the mobile terminal when the map data updating request information is received.