An oxygen inhalator belongs to medical equipment and is mainly used for humidifying oxygen. The oxygen inhalator comprises a substrate, an air inlet pipe, an air outlet pipe, a humidifying bottle and a humidifying pipe which is arranged in an inner cavity of the humidifying bottle, the substrate is connected to the top of the humidifying bottle, one end of the air inlet pipe is connected with the substrate, the other end of the air inlet pipe is communicated with a medical oxygen supply system, the air outlet pipe is connected onto the substrate, one end of the air outlet pipe is communicated with the inner cavity of the humidifying bottle, the other end of the air outlet pipe is communicated with an oxygen supply device, the top of the humidifying pipe is connected onto the substrate and communicated with the air inlet pipe, the bottom of the humidifying pipe is arranged in neutral water in the inner cavity of the humidifying bottle, the bottom of the humidifying pipe is provided with a silencing device for lowering the noise produced when the oxygen is humidified, an outer lining is sleeved outside the humidifying bottle, the top of the outer lining is connected with the humidifying bottle into a whole, and a vacuum cavity is formed between the inner wall of the outer lining and the outer wall of the humidifying bottle. The oxygen inhalator has the advantages that the noise produced by the humidification of the oxygen can be greatly lowered.