The invention provides a medical emergency oxygen supply device, and mainly relates to the technical field of emergency treatment. A medical emergency oxygen supply device comprises a box body with an opening in the top face, the right side face of the box body is higher than the other three faces of the box body, two vertical plates are installed on one side of the interior of the box body; a containing plate is rotationally installed between the two vertical plates through a rotating shaft; an oxygen bottle is installed on the top face of the containing plate; and two inclined telescopic rods are hinged to the bottom face of the containing plate; the bottom ends of the two telescopic rods are hinged to the box body; and a rectangular groove is formed in one side of the box body. The oxygen bottle storage box has the beneficial effects that through cooperative use of the box body and the box cover, an oxygen bottle can be stored in a sealed space in the box body and can be prevented from being affected by the external environment; the safety and the service life of the oxygen bottle are guaranteed; meanwhile, after the box body is matched with the box cover, appliances can be temporarily placed on the top face of the box cover; and the use is convenient. The space is saved, the oxygen bottle is protected, and meanwhile convenience is brought to medical staff.