Silver nanowires (AgNWs) with length-to-diameter ratio of about 800 were prepared by alcohol reduction method, next a network-like structure of AgNWs was constructed via dispersion method. Then PVDF film is prepared by solution casting method, and different mass fraction of polyurethane (TPU) is added to improve the flexibility of the film to form a PVDF/TPU composite film. The AgNWs mesh is fixed on both sides of the PVDF/TPU flexible film to form a capacitive electrode plate, and the AgNWs were used to form a variable-pitch flexible film capacitive sensor. The structure of AgNWs was characterized by scanning electron microscope(SEM), ultraviolet-visible spectroscopy, and XRD; the performance of the flexible thin film capacitive sensor was tested by electronic tensile tester, square resistance meter, three-electrode test system, LCR digital bridge, etc. The results show that: the square resistance of the single-sided polar plate of the capacitor formed by network-like AgNWs is 15.635 mΩ/sq; when the mass ratio of TPU to PVDF is 2:8 the elongation at break of the film is 91.2%, the toughness is the best, The specific capacitance was 375 μF/g; as the bending angle of the sensor increased, the output capacitance also continued to increase. The bending angle and the output capacitance value showed a linear relationship within a certain range. When the bending angle reached 180° the maximum capacitance is 436 μF.