The invention relates to a superhigh pressure large-traffic pressurizing and unloading system, belonging to a superhigh rapid-loading, unloading hydraulic control system for delivery and type tests of a hydraulic support. The invention mainly solves difficult technical problems about low efficiency of pressurizing loading and unloading in current internal-loading hydraulic support test bench, andabout frequency failures caused by large impact on hydraulic elements of the system. The technical proposal employed by the invention is as below: the superhigh pressure large-traffic pressurizing and unloading system includes a hydraulic source, a stop valve and a pressure cylinder, wherein the system further includes a pressure reducing valve, electro-hydraulic reversing valves, a pilot operated check valve, a throttle valve and a check valve, an primary pressure opening of the pressure reducing valve is connected with the hydraulic source via the stop valve, a secondary pressure opening ofthe pressure reducing valve is connected with an liquid inlet P of the electro-hydraulic reversing valve; an A opening of the electro-hydraulic reversing valve is connected with a low pressure chamber of the pressure cylinder, a low pressure rod chamber of the pressure cylinder, an O opening of the electro-hydraulic reversing valve and an O opening of another electro-hydraulic reversing valve areconnected with a liquid supply tank via the stop valve.