Abstract: The present invention provides a flow control switch including a pipeline structure, a rotating structure, a position-limiting structure and a knob structure. The pipeline structure includes a tubular body and a ball body rotatably disposed in the tubular body. The rotating structure includes a rotatable element connected to the ball body for driving the ball body to rotate. The position-limiting structure is disposed on the tubular body. The knob structure is liftably disposed on the rotating structure for cooperating with the rotatable element. The position-limiting structure has a first and a second position-limiting groove. The knob structure includes a knob body liftably disposed on the rotatable element and a position-limiting element detachably disposed on the knob body. The position-limiting element is optionally disposed in one of the first and the second position-limiting groove, so as to limit a rotation of the rotatable element relative to the position-limiting structure.