The utility model relates to the field of medical supplies and in particular relates to an oxygen humidifying device for a patient after tracheotomy. At present, the oxygen humidifying device is directly connected with a trachea cannula in the clinical application for the patient after tracheotomy, and the humidifying and atomizing effect of the oxygen is affected by the inclined oxygen humidifying device during the working process for the horizontal-position patient after the tracheotomy. The technical scheme of the utility model is as follows: the oxygen humidifying device comprises an oxygen atomizer, an oxygen transfer joint and a threaded hose, wherein the oxygen transfer joint is in the form of a barrel; an insertion head which is connected with the threaded hose is arranged on the middle part of the oxygen transfer joint; an insertion port which is connected with the trachea cannula is formed at the end part of the oxygen transfer joint; an annular slot is formed around the insertion port at the inner side of the oxygen transfer joint; and the threaded hose is connected with the oxygen atomizer. The oxygen humidifying device disclosed by the utility model overcomes the defects in the prior art; the optical working status of the oxygen atomizing device is ensured by the threaded hose according to the bending position of the patient, so that the oxygen physical humidifying effect is ensured. Meanwhile, the water in a humidifying bottle is prevented from flowing to the trachea cannula, so that no harms are caused to the patient.