The invention discloses a medical oxygen inhalation device. The device comprises an oxygen generator and an oxygen inhaler, the oxygen generator comprises an air compressor, a nitrogen removal box, amolecular sieve adsorber, a condenser and a gas-water separator which are sequentially arranged inside from bottom to top, the air compressor, the nitrogen removal box, the molecular sieve adsorber, the condenser and the gas-water separator are sequentially communicated, an oxygen bin is arranged on the oxygen generator, the oxygen bin is connected to an oxygen outlet pipeline, the oxygen outlet pipeline is controlled by a control switch, the oxygen outlet pipeline is connected to the detachable oxygen inhaler, the oxygen inhaler is provided with a connecting oxygen conveying connector and anoxygen conveying switch, and the oxygen conveying connector is connected into a nasal cavity of a human body through an oxygen conveying pipe. The device is reasonable in design, simple in structure,beneficial to successful independent use of the oxygen inhaler and the oxygen generator, capable of being used in a combined mode and more convenient to use according to actual conditions.