Range hood based on airflow internal circulation and control method thereof

The invention discloses a range hood based on airflow internal circulation and a control method thereof, and relates to the technical field of lampblack purification. The range hood comprises a range hood body and a desorption regeneration component, wherein the desorption regeneration component is fixedly installed at the upper end of the range hood body, the desorption regeneration component comprises a box body, a smoke deflector is hinged to the upper surface of the box body, and a filter screen is fixedly installed on the bottom surface of the box body; a purification component used for desorbing VOCs on the filter screen is arranged in the box body, the purification component comprises a fan cover plate and an air collecting cover, and an air inlet and an air outlet are formed in the outer side face of the fan cover plate; the air collecting cover is fixedly connected to the inner side face of the fan cover plate, and the air inlet is communicated with the interior of the air collecting cover; and a fan