▎ 摘　　要

NOVELTY - Preparing three-dimensional porous graphene/polyurethane flexible stress-strain sensor involves adding graphene oxide to water, subjecting to ultrasonic dispersion treatment to obtain a graphene oxide solution, adding a reducing agent to the graphene oxide solution, and mixing uniformly to obtain solution A, mixing the surfactant with the solution A uniformly to obtain solution B, immersing the polyurethane sponge in the solution B, taking out and heating up to perform a reduction reaction, and freeze-drying to obtain a three-dimensional porous graphene/polyurethane composite material, coating the upper and lower sides of the three-dimensional porous graphene/polyurethane composite material with conductive silver paste, bonding copper electrode, and encapsulating the three-dimensional porous graphene/polyurethane flexible stress-strain sensor. USE - Method for preparing three-dimensional porous graphene/polyurethane flexible stress-strain sensor. ADVANTAGE - The method does not need the precise micro-nano structure design process, has high sensitivity and good detection capability of micro-pressure, in simple and cost-effective manner.