Modular oxygen generator

The utility model discloses a modular oxygenerator which comprises a plurality of molecular sieve adsorption tanks arranged in parallel, the air inlet ends of the molecular sieve adsorption tanks are connected with the air outlet end of an air buffer storage tank, and the air inlet end of the air buffer storage tank is connected with an air inlet pipe through an air compression pump. Gas outlet ends of the molecular sieve adsorption tanks are respectively connected with a gas inlet end of an oxygen buffer storage tank, a main gas outlet pipe and a bypass gas outlet pipe are arranged on the oxygen buffer storage tank, an oxygen booster pump is arranged on the main gas outlet pipe, a gas outlet end of the oxygen booster pump is connected with an oxygen output pipeline, and a gas outlet end of the bypass gas outlet pipe is connected with the oxygen output pipeline. An output one-way valve is arranged on the oxygen output pipeline, the gas outlet end of the bypass gas outlet pipe is communicated with the gas inle