The invention discloses a trachea cannula fixing device. The trachea cannula fixing device comprises a device body, wherein the device body is in a strip shape, the cross section of the device body isin an arc shape, the central angle of the device body is greater than 180 degrees, the device body comprises an outer layer, a pull rope cavity, a safety bag and an inner layer which are arranged insequence from outside to inside, and the outer layer, the pull rope cavity, the safety bag and the inner layer are arranged coaxially; the outer layer is made from a flexible material; the pull rope cavity is internally provided with a pull rope, and the two ends of the pull rope penetrate through the two circumferential end faces of the pull rope cavity respectively; the safety bag is filled withsodium azide; the inner layer is made from polyethylene. The trachea cannula fixing device has the advantages that a trachea cannula is fixed conveniently, and the trachea cannula is prevented from being bitten and closed by a patient.