Underground air duct wall surface temperature control device

The utility model discloses an underground air duct wall surface temperature control device which comprises a plenum chamber, the plenum chamber is annularly arranged on a wall surface near an air duct opening, two slot type jet flow nozzles are arranged on one surface, facing the air duct opening, of the plenum chamber, and a fan is arranged in the plenum chamber and connected with a heat preservation air pipe. The fan can directly introduce external air into the static pressure box, and two layers of air films are formed from the two slot type jet flow nozzles; the inner side air film is attached to the wall surface and controls the temperature of the wall surface, so that the temperature of the wall surface is consistent with the temperature of the external environment; the outer side air film and the inner side air film are arranged at intervals and arranged on the side away from the wall face, and the outer side air film can prevent exhaust air heat in the air channel from being transmitted to the inner