NOVELTY - A photovoltaic cable with polyolefin sheath material contains 50-70 pts. wt. linear low density polyethylene, 20-30 pts. wt. ethylene vinyl acetate (EVA), 10-15 pts. wt. polyolefin elastomer, 10-20 pts. wt. maleic anhydride grafted polyethylene, 1-2 pts. wt. vinyl tris( beta -methoxyethoxy)silane, 8-12 pts. wt. nano diatomite, 10-15 pts. wt. magnesium hydroxide, 4-8 pts. wt. sodium tetraborate, 3-5 pts. wt. urea, 5-10 pts. wt. dimethyl trimethylsilylmethylphosphonate, 10-15 pts. wt. octyl phthalate, 4-8 pts. wt. hydroxyl silicon oil, 3-5 pts. wt. polyethylene wax, and 5-10 pts. wt. mica powder.    USE - A photovoltaic cable with polyolefin sheath material (claimed).    ADVANTAGE - Product is halogen-free, environment-friendly, and safe has low-smoke and very good tensile strength, heat resistance, UV aging resistance, oil resistance, acid resistance, alkali resistance, ozone resistance, wear resistance, weather fastness, and flame retarding effect.    DETAILED DESCRIPTION - A photovoltaic cable with polyolefin sheath material contains 50-70 pts. wt. linear low density polyethylene, 20-30 pts. wt. ethylene vinyl acetate (EVA), 10-15 pts. wt. polyolefin elastomer, 10-20 pts. wt. maleic anhydride grafted polyethylene, 1-2 pts. wt. vinyl tris( beta -methoxyethoxy)silane, 8-12 pts. wt. nano diatomite, 10-15 pts. wt. magnesium hydroxide, 4-8 pts. wt. sodium tetraborate, 3-5 pts. wt. urea, 5-10 pts. wt. dimethyl trimethylsilylmethylphosphonate, 10-15 pts. wt. octyl phthalate, 4-8 pts. wt. hydroxyl silicon oil, 3-5 pts. wt. polyethylene wax, 10-15 pts. wt. active calcium carbonate, 5-10 pts. wt. mica powder, 15-25 pts. wt. carbon black N660, 1-2 pts. wt. calcium-zinc composite stabilizer, 0.5-1.5 pts. wt. tris-(2,4-di-tert.-butylphenyl)phosphite (antioxidant 168), 1-2 pts. wt. dilauryl thiodipropionate (antioxidant DLTP), and 3-5 pts. wt. compound filler. Preparation of compound filler involves weighing 10-15 pts. wt. montmorillonite, 5-10 pts. wt. illite, 8-12 pts. wt. dolomite, 4-6 pts. wt. jade powder, 5-8 pts. wt. nano silicon dioxide, 2-3 pts. wt. N-2-(aminoethyl)-3-aminopropyl trimethoxysilane, 1-2 pts. wt. triallyl cyanurate, 3-6 pts. wt. nano magnesium oxide, 1-2 pts. wt. zinc stearate, and 12-16 pts. wt. epoxy soybean oil, calcining montmorillonite, illite, and dolomite at 540-560 degrees C for 2-4 hours, cooling to room temperature, adding 10-15% concentration of hydrochloric acid solution, soaking in 70-80 degrees C water bath for 1-2 hours, filtering, washing with distilled water until neutral, drying, crushing to less than or equal to 10 mu m particle diameter, mixing obtained powder with remaining ingredients, grinding, and mixing uniformly. An INDEPENDENT CLAIM is included for preparation of photovoltaic cable with polyolefin sheath material which involves stirring EVA, polyolefin elastomer, urea, dimethyl trimethylsilylmethylphosphonate, mica powder, and composite filler by high speed mixer at 1000-1500 rpm for 3-5 minutes, extruding mixed material by double screw extruder at 150-170 degrees C to obtain composite filler master batch, mixing linear low density polyethylene, octyl phthalate, nano diatomite, magnesium hydroxide, sodium tetraborate, and oxidized polyethylene wax by high-speed mixer at 75-85 degrees C for 4-6 minutes, adding composite filler master batch, maleic anhydride grafted polyethylene, hydroxy silicone oil, calcium carbonate, and carbon black N660, continuously mixing for 3-5 minutes, reducing temperature to 50-60 degrees C, adding remaining raw materials, mixing for 2-3 minutes, discharging, extruding and granulating mixed material by double-screw extruder at 160-180 degrees C, cooling, filtering magnetic separation, measuring, and packing.