The invention relates to a visualization device for a fog flow field of an unmanned gyroplane, and a control method. The device comprises a test section of a wind tunnel, an unmanned plane, a telescopic suspension system, a laser emitter, a short pulse ultraviolet radiator, a camera, a computer, and a tracer particle smoke generator. The unmanned plane is fixed in the test section of a wind tunnel through the telescopic suspension system. A medicine tank holds a fluorescence solution. The laser emitter is placed right above the rotor wing of the unmanned plane, and is used to irradiate and display a turbulent flow field below the rotor wing in the test section of the wind tunnel. The short pulse ultraviolet radiator is placed out of the test section of the wind tunnel, and is slantly below the unmanned plane. The tracer particle smoke generator is on a wind inlet of the test section of the wind tunnel. The camera is connected with the computer, and is used to obtain tracer particle image information representing motion law of unmanned plane rotor wing fog flow field, and transmit the image information to the computer to process. The device is simple in operation, high in controllability, good in repeatability, and high in result reliability.