The utility model discloses a nasal cavity passageway diameter sound -pipe relates to medical consumptive material field, and it has a front end to have before one big guide portion, the outside in little back be equipped with the detection body of length sign, and two positions are provided with the through -hole about the pipe wall of guide portion, and the external measurement gasbag that is equipped with of sound -pipe after guide portion is measured the gasbag and is connected with the inflater through the check valve through the gas tube, is equipped with and measures the scale that the big or small corresponding reflection gas injection of gasbag diameter was measured on the inflater, the detection body passes through the entry to be connected with breathing machine or aspirator, can provide oxygen supplying channel or attract nasal cavity incretion. The utility model discloses can solve the measurement problem that the nasal cavity passageway passes through the diameter size, select suitable intubate pipe to provide the basis for advancing menstruation nose trachea cannula, avoid adopting inappropriate intubate pipe to lead to the hemorrhage mistake that arouses of schneiderian membrane damage to inhale the scheduling problem.