The invention discloses an oxygen saver, which is characterized by comprising a pressure stabilizer, a flow controller and an air storage valve, wherein the air storage valve is provided with a sense valve; the pressure stabilizer mainly comprises a spring box and a dish components; the spring box in a sealing air inlet is matched with the dish component; an air chamber is arranged in the dish component; two or more pores are arranged on the lower surface of the air chamber; a flow regulating inner turnplate communicated with the pores is arranged in the flow controller; the air storage valve is connected with the flow regulating inner turnplate; and an air sub-outlet which is externally connected with an oxygen pipe is arranged on the output end of the air storage valve. The invention can be arranged on an oxygen cylinder to control pressure and flow of oxygen output from the oxygen cylinder, so as to reach the pressure and flow requirements for normal use. The invention has the advantages of simple structure and easy control.