A device for positioning tracheostomy tube includes a tracheostomy tube and a tracheostomy tube protecting membrane. The tracheostomy tube protecting membrane includes a tearing line portion formed at two sides of the tracheostomy tube protecting membrane. The tracheostomy tube protecting membrane is used for mounting in a trachea of a patient to form a positioning path for the tracheostomy tube. The tearing line portion is used for being torn open and removed. The present invention utilizes the tracheostomy tube protecting membrane to be mounted in a trachea of a patient first. The tracheostomy tube protecting membrane can effectively protect the trachea of the patient.