Abstract: Flexible pressure sensors have enormous potential for application in wearable devices and electronic skins, but existing flexible pressure sensors often lack the ability to perceive dynamic stimuli and high-frequency vibrations. We propose a piezoresistive flexible pressure sensor that significantly improves the response time and relaxation time of the flexible sensors, and can accurately capture mechanical stimuli exceeding 20 kHz. Meanwhile, the sensor can detect a minimum pressure of 1 Pa and has a wide pressure sensing range of 1 Pa to 1000 kPa. In addition, we have developed a structural vibration testing system and a sound detection system, which have verified the wideband multifunctional detection capability of the developed sensor. This demonstrates the potential of the flexible piezoresistive sensor in high-frequency vibration sensing and acoustic applications, providing new design ideas for the development of flexible wearable devices and electronic skins.