<p>A water treatment system comprises a flow controller and a liquid treatment unit which is suitable for connecting to the flow controller, wherein the liquid treatment unit comprises a first fluid treatment unit and a second fluid treatment unit; and the flow controller comprises a first flow control element and a second flow control element. The second flow control element is in contact with the first flow control element and can rotate relative to the first flow control element. A user can control the operating states of the first fluid treatment unit and the second fluid treatment unit through the flow controller, thereby achieving the functions that the water treatment system treats liquid and the liquid flushes the water treatment system.</p>
