A water flow control device including a control valve mounted in a casing and controlled by a control rod through an actuating rod to close/open the water discharging port, the control valve including a valve flap having a center hole and a plurality of axial ribs axially downwardly extended from the periphery of the center hole and being moved to close/open the water discharging port of the upright tube of the casing, an axle having a bottom end inserted through the center hole of the valve flap and a top end vertically slidably inserted into a downward bottom hole in the cup-shaped holder of the cup-like casing mounting base, a valve element fixedly mounted around the axle in the middle and moved with it to open/close the center hole of the valve flap, and a stem fixedly connected to the bottom end of the axle and moved by the actuating rod to lift the valve flap from the upright tube of the casing.
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