The invention discloses a wearable piezoresistive sensor system and preparation technology thereof, and provides new preparation technology of piezoresistive material. According to the technology, polymer foaming material is used as a substrate, micron metal copper wires are utilized to change a contact area and contact behaviors between the piezoresistive material and an equipment electrode, amplification effects of detection sensitivity and a pressure detection scope of a sensor are generated, and a sensing effect of the sensor is significantly improved. The sensor of the invention is a small-range pressure sensor with high sensitivity and high flexibility and elasticity, can be widely applied to electronic skins and wearable equipment, and has a very great potential application value.