The invention relates to an aircraft oxygen emergency device comprising a chemical oxygen generator, an oxygen supply line including a first line section connecting said chemical oxygen generator with a flow regulator unit and a second line section connecting said flow regulator unit with at least one oxygen mask for supplying oxygen to mouth and/or nose of a person at a breathing pressure. According to the invention, said second line section comprises an upstream second line section connecting said flow regulator unit with a throttle unit and a downstream second line section connecting said throttle unit with the oxygen mask, wherein oxygen flowing from the chemical oxygen generator to the oxygen mask via said oxygen supply line passes through said throttle unit and said throttle unit has a cross section which is small enough to increase the pressure within the chemical oxygen generator.