The invention relates to an insulating material for a wiring harness and specifically relates to a modified low-density polyethylene insulating material for a household appliance wiring harness. The material is prepared from the following raw materials in parts by weight: 12-15 parts of nylon PA (Polyamide) 66, 10-14 parts of polybutylene terephthalate, 34-38 parts of low-density polyethylene, 2-3 parts of an antioxidant 1010, 2-3 parts of calcium laurate, 18-20 parts of glycerin triacetate, 3-4 parts of sodium hexametaphosphate, 15-18 parts of polyvinylidene chloride, 15-20 parts of active calcium carbonate, 4-7 parts of zinc oxide, 12-15 parts of aluminum hydroxide, 13-14 parts of microcrystalline wax, 22-25 parts of fast extruding furnace carbon black N660, 1-2 parts of accelerator Na-22 and 14-16 parts of auxiliaries. The insulating material disclosed by the invention is combined with the advantages of materials such as low-density polyethylene, nylon PA66 and polyvinylidene chloride, so that performances of the conventional low-density polyethylene material are improved, the processing performances and mechanical performances are good; the prepared material is high in strength, waterproof, flame-retardant, low temperature impact-resistant and tearing-resistant, can be extensively used for manufacturing the insulating sheath of the wiring harness at each part of the household appliance, a wiring terminal, a binding material, and the like, and is broad in prospect of market needs.