An oxygen emergency supply device for an aircraft includes an oxygen pressure vessel, which is in fluid connection with at least one oxygen mask. Means for closing and opening the oxygen pressure vessel, means for pressure reduction, a pressure regulation device, and a flow throttle are provided in the conduit connection between the oxygen pressure vessel and the oxygen mask. The oxygen emergency supply device further includes a control device. A controllable shut-off valve forms the means for closing and opening the oxygen pressure vessel, the means for pressure reduction and a part of the pressure regulation device.