The embodiment of the utility model provides a working medium pressure self -adaptation cryogenic refrigerating system relates to the refrigeration field, can solve the working medium high pressure problem that appears when refrigerating system starts. This system includes compression refrigeration device, middle regenerator and first throttle unit and evaporimeter unit, the thermal current of middle regenerator enters the mouth through the first export intercommunication of pipeline with the compression refrigeration device, and the thermal current export of middle regenerator is through first entry of throttling unit connection to evaporimeter unit, the first cold flow entry of middle regenerator communicates through the export of pipeline with the evaporimeter unit, and the cold flow export of middle regenerator is through the entry intercommunication of pipeline with the compression refrigeration device, the second cold flow entry of middle regenerator is through the second export intercommunication of pipeline with the compression refrigeration device, cryogenic refrigerating system still includes: working medium inflation storage device.