Control method and device of range hood and range hood

The invention relates to a control method and device of an extractor hood and the extractor hood. The control method of the range hood comprises the steps that the concentration difference of the range hood in a first detection period in the operation process is obtained, and the concentration difference is the difference value of the first oil smoke concentration and the second oil smoke concentration; the concentration difference variable quantity of the first detection period is determined, the concentration difference variable quantity is the difference value of the concentration difference of the extractor hood in the first detection period and the concentration difference of the extractor hood in a second detection period, and the second detection period is before the first detection period; and controlling the fan rotating speed of the extractor hood according to the concentration difference variable quantity of the first detection period. The situation of misinformation of the oil smoke concentration