The utility model discloses a flexible pressure sensor of carbon back resistance -type, sensor are the four layers thin film composition, composite films layer and oxidation graphene films insulation protective layer including flexible polyimide film layer, silver electrode layer, flexible graphite alkene and oxidation graphite alkene. When this pressure sensor receives pressure effect or takes place bending strain, can obtain pressure sensor's the atress condition through the resistance change value of measuring the silver electrode both ends. The utility model discloses wholly be the film column structure, flexible nature is good, can normally work under the state of crooked arbitrary angle degree, sensitivity is high, answer varying coefficient 2.1 3 between, the ressure measurement wide range is for 10Pa to 900kPa, have very high resolution ratio and supper -fast dynamic response, can measure the dynamic high frequency pressure signal up to 10kHz, it is good to stablize nature, has passed through the stable retest more than 8000 times. Its preparation technology is simple, and equipment cost is low, is applicable to wearable equipment, and the physical quantity is measured to can be used to pressure, meet an emergency etc..