Conductive flame-retardant bending-resistant integrated composite yarn and preparation method thereof

The invention relates to a conductive, flame-retardant and bending-resistant integrated composite yarn and a preparation method thereof, and the method is as follows: the surface of a conductive filament is sequentially coated with a copper foil, a flame-retardant modified polymer melt and a functional polymer fiber membrane to prepare the conductive, flame-retardant and bending-resistant integrated composite yarn, the functional polymer fiber membrane is coated before the flame-retardant modified polymer melt is completely cooled; the prepared composite yarn is of a skin-core structure and sequentially comprises a conductive wire layer, a copper foil layer, a flame-retardant layer and a functional layer from inside to outside. The conductive wires are formed by bundling carbon fibers; the flame-retardant layer is a flame-retardant modified PU layer or a flame-retardant modified SEBS layer; the functional layer is a meta-aramid fiber membrane, a polyimide fiber membrane or a polyarylsulfone fiber membrane; th