Provided is a washing machine and control method thereof. The washing machine includes at least one magnet attached to an auxiliary wash tub detachable from a main wash tub; a switching device configured to output a detection signal when the at least one magnet approaches within a preset range to the switching device; and a controller configured to determine whether the auxiliary wash tub is installed based on whether the detection signal of the switching device is output, and control a component in the washing machine based on the determination of whether the auxiliary wash tub is installed.