A gas mixing flow control valve comprises a gas outlet tube, a valve body, valve rods and a hand wheel rod. The gas mixing flow control valve is characterized in that the two ends of a round-tube-shaped valve body are each provided with a valve body inner tube, a square valve block connected with the inner wall of the valve body is installed on the inner end side of each valve body inner tube, a spring is installed between the two valve blocks, each radial valve rod is installed in the middle of the corresponding valve body inner tube, the middle portion of each valve rod is provided with an eccentric wheel, and the edge of each eccentric wheel is in contact with the corresponding valve block; and the radial gas outlet pipe is arranged in the middle of the valve body, so that the valve body is in a tee joint shape. The gas mixing flow control valve solves the problem that the ratio between fuel gas and air of a common valve is fixed and is particularly suitable for control over mixing of two kinds of gas.