The present disclosure provides a cleaning device and a cleaning method implemented by the cleaning device. The cleaning device is used for cleaning a water supply pipe, and comprises: a cleaning unit, which is at least partially provided inside the water supply pipe; a control unit, which is connected to the cleaning unit, for detecting whether volume of a foreign body left on an inner wall of the water supply pipe exceeds a preset volume, when it is determined that the volume of the foreign body left on the inner wall of the water supply pipe exceeds the preset volume, controlling the cleaning unit to clean the water supply pipe so as to remove the foreign body on the inner wall of the water supply pipe. In this disclosure, foreign bodies left on the inner wall of the pipe can be removed automatically, thus normal water supply can be ensured.