The invention discloses a power distribution box case material and a preparation method thereof, and relates to the field of a power distribution box material. The power distribution box case materialis prepared from the following raw materials in parts by weight: 35 to 50 parts of polycarbonate, 20 to 28 parts of polyphenyl ether resin, 6 to 12 parts of ethylene zinc ene copolymers, 3 to 8 partsof dioctyl phthalate, 14 to 20 parts of acrylic resin, 12 to 18 parts of kaolin, 5 to 13 parts of dolomite, 4 to 10 parts of aluminum triphosphate, 7 to 15 parts of silicon carbide, 6 to 12 parts ofmodified carbon nanometer tubes, 5 to 10 parts of nanometer titanium dioxide, 5 to 10 parts of nanometer zinc oxide, 2 to 4 parts of white carbon black, 1 to 4 parts of polyethylene wax, 0.6 to 1.5 parts of silane coupling agents and 1.2 to 1.8 parts of antioxidants. Through the cooperated effects between the raw materials, the power distribution box case material has the advantages of anti-corrosion performance, good weather resistance performance and temperature resistant performance, pressure resistance, mechanical impact resistance, anti-scratching performance and excellent heat conductionperformance.