The invention provides an oxygen generator with functions of reducing noise and preventing overheating. The oxygen generator comprises an air compressor which is hidden in an oxygen generator protection shell and used for compressing air, a drawer-type base plate which is arranged above the air compressor and can move back and forth, a compressed air supply system which is connected with the air compressor and is used for supplying compressed air to adsorption beds, and a compressor which is provided with a nozzle opening and is arranged in the protection shell; the oxygen generator also comprises multiple adsorption beds, multiple flow paths and electromagnetic valves in the adsorption beds, wherein the adsorption beds separate the air compressed by the compressor and are used for absorbing nitrogen gas to generate oxygen gas; the multiple flow paths are mounted between the compressor and the adsorption beds and connected with the compressor; the flow paths are applied to the flow paths forked from the adsorption beds and used for performing flow path separation on the nitrogen gas generated in the adsorption beds; the electromagnetic valves are used for removing nitrogen gas and automatically controlling an air distribution valve; the oxygen generator further comprises a control center which can selectively regulate the switching time of the electromagnetic valves to control the pressure of the compressed air flowing in from the compressor. The oxygen generator provided by the invention aims to prolong the machine life and remarkably shorten the running time of a cooling fin so as to reduce noise.