The present invention provides a control valve for a water channel, which comprises of, from top to bottom, a control shaft bolt, a sliding valve disc, a fixing valve disc and a valve base. A valve shell combining with the valve base covers around a lower portion of the control shaft bolt, the sliding valve disc and the fixing valve disc to prevent mentioned components from falling out. The amount and the open/close operation of the two different kinds of water sources can be operated and controlled by a single control valve of the water channel to simplify the complexity in structure. Also it is convenient for a user to control the amount and the open/close operation of two different water sources by a single control valve.