A thermal insulation suction nozzle is disclosed, including a hollow inner tube, where an outer wall of the inner tube extends outwardly in a radial direction to form at least two partition plates, an adjusting ring is further sleeved on the inner tube in a rotatable manner, at least two partition spaces between the inner tube and the adjusting ring are partitioned by the partition plates, air inlet holes are disposed in a lower part of the adjusting ring, the number of the air inlet holes being the same as the number of the partition plates, and the adjusting ring is rotated outside the inner tube so as to enable the air inlet holes to communicate with or close the partition spaces. The thermal insulation suction nozzle has the advantages of preventing harms to the oral cavity caused by vapor and improving the degree of comfort for inhalation.
