Intelligent smoke exhausting range hood

The utility model relates to an intelligent smoke exhausting range hood. The intelligent smoke exhausting range hood comprises a machine body, a fan, a main controller, an infrared spectrum sensing system and a driving circuit, wherein the main controller is used for controlling the fan to work; the infrared spectrum sensing system comprises an infrared light emitting part, an infrared light receiving part, an optical sensing system and a spectrum analysis system; infrared light emitted by the infrared light emitting part is emitted to a smoke area under the machine body and then transmitted or reflected by smoke; the transmitted or reflected light is received by the infrared light receiving part and then transmitted to the spectrum analysis system by virtue of the optical sensing system; the spectrum analysis system is used for calculating smoke concentration data according to the spectrum of the received infrared light and transmitting the data to the main controller; the main controller comprises a rotation speed calculating unit; the calculating unit is used for judging a gear of the fan according to the smoke concentration data calculated by the spectrum analysis system and outputting a driving signal according to the gear of the fan; the driving circuit is connected with the main controller and used for receiving the driving signal of the rotation speed calculating unit and driving the fan to rotate at a corresponding rotation speed.