The invention relates to a graphene polymerized nano-energy heating wire and a preparation method thereof. The heating wire comprises a heating core body and a protective layer. The heating core body is formed by weaving a plurality of polymerized nano-energy wires, the protective layer comprises an insulating layer and a waterproof layer, wherein the insulating layer and the waterproof layer are sequentially arranged from inside to outside, and the protective layer tightly wraps the heating core body. The polymerized nano-energy wires are prepared from the following components: polymerized fibers, graphene, kaolin, antimony, negative ion powder, tourmaline, shale, ceramic balls, a flame retardant, a polar solvent and a cross-linking agent. The graphene polymerized nano-energy heating wire and the preparation method thereof are safe, environmentally friendly, high in heating speed, extremely high in heating efficiency, long in service life, resistant to bending, free of thermal expansion and cold contraction deformation, not likely to be damaged, waterproof, anti-electric shock and fireproof, have the air purification function and the health preserving function, and are simple in preparation method and high in flexibility.