The utility model provides a communication tube, including a pipe body, the body cross section is by arc and the shape that connects to form of straight line, and evenly on the body arcwall face is equipped with a plurality of ventilation grooves, is equipped with the strengthening rib that is located on the body between the adjacent ventilation groove, be equipped with a plurality of fin on the planarea, state the ventilation groove and be connected with ventilation unit, ventilation unit includes inner tube and outer tube, inner tube and ventilation groove intercommunication, the outer tube top is equipped with sealed lid, upper portion is equipped with the air vent, is equipped with the interlayer that is located the middle part between outer tube and the inner tube, just the inboard upper portion of inner tube is equipped with the fan, and upper portion is the contraction section in the inner tube, is the changeover portion above the contraction section, the body is equipped with first rubber layer, fibrage layer, communication layer, second rubber layer, shielding layer and third rubber layer from inside to outside in proper order. The beneficial effects of the utility model are that: simple structure, good, the long service life of radiating effect.