Burner

The utility model discloses a burner, which comprises an oil inlet, an oil nozzle, an air inlet, an air door, a secondary air outlet, a tertiary air outlet, and a casing closing surface. The utility model is characterized in that the air door is a moving structure which can be pushed backwards and forwards; a circular hole-shaped primary air outlet with the diameter of from 4 mm to 12 mm is arranged at a point from 3 mm to 20 mm away from the front of the oil nozzle. The utility model has the advantages that if such a structural burner is used, high pressure oil is not needed to ignite, and mediums are not needed to ignite and burn; the utility model can burn a small amount of oil, a large amount of oil, and inferior oil.