This study introduces a novel method for improving iontronic capacitive pressure sensors by substituting traditional electrodes with piezoresistive graphene-polyurethane (G-PU) sponge. Adjusting the sponge’s resistance variation range allows for precise control of the interfacial electric double layer (EDL) capacitance, which facilitate to the performance of the sensor with a linear range of 0-2300 kPa and a linearity of 0.98. This approach provides high-resolution detection of 35 kPa across an ultra-wide pressure range exceeding 2000 kPa. This method effectively addresses the need for diverse application requirements across varying pressure intervals in advanced pressure sensing systems.