The invention provides a compound flexible conductive fabric, a flexible mechanical sensor and a preparation method of the compound flexible conductive fabric. The compound flexible conductive fabricis a flexible fabric with the surface modified by carbon nanotubes; the preparation method comprises the main steps: placing the flexible fabric into a dispersion solution of the carbon nanotubes, andimmersing and drying to prepare the flexible conductive fabric, wherein the immersion time is 15 to 15min, ultrasonic treatment is carried out in an immersion process, the drying temperature is 60 to100 DEG C and the drying time is 1 to 3h. The flexible mechanical sensor is prepared by utilizing the compound flexible conductive fabric. A preparation technology of the compound flexible conductivefabric, provided by the invention, is simple and the cost is low, so that continuous large-scale production can be realized; the flexible mechanical sensor based on the compound flexible conductive fabric, provided by the invention, can be used for simultaneously inducing and distinguishing pressure and a friction force; the sensor has high sensitivity and strong tolerance and is not easy to damage.