The utility model relates to a pressure filtration system that customizable export mass dryness fraction required, include the pump of being connected with the pressure filter, the pump includes charge pump and press pump, installs the humidity detection instrument on the filter plate of pressure filter, the probe of humidity detection instrument stretches into in the straining chamber of pressure filter, pressure filtration system still include with the PLC control system that humidity detection instrument and pressure filter are connected, the data management pressure filter that PLC control system detected according to the humidity detection instrument the charge pump the pressure and the time of press pump. Mass dryness fraction through to the export filter cake detects, adjusts the solid -liquid separation disposal system of pressure filter in real time, has both satisfied the appointed product mass dryness fraction requirement of customer, also very big improvement the treatment effeciency of pressure filter, reduced the treatment cost of pressure filter.