Flexible sensing composite film with high sensitivity and wide detection range as well as preparation method and application of flexible sensing composite film

The invention discloses a flexible sensing composite film with high sensitivity and wide detection range as well as a preparation method and application of the flexible sensing composite film. The preparation method of the flexible sensing composite film comprises the following steps: (1) adding thermoplastic polyurethane, ethyl cellulose and an ethylene-vinyl acetate copolymer into a mixed solvent, and stirring and dissolving in a constant-temperature water bath to obtain an electrostatic spinning solution; (2) performing electrostatic spinning on the electrostatic spinning solution to obtain a TPU/EC/EVA composite film, wherein a layer of metal mesh screen attached with tin foil paper at the bottom is adhered to a roller receiver; and naturally air-drying the composite film, placing the composite film in a silver nanowire ethanol dispersion liquid, carrying out ultrasonic treatment, and drying to obtain the flexible sensing composite film. The flexible sensing composite film is prepared by using an electros