NOVELTY - A weather-resistant crosslinked polyolefin composition comprises: polyolefin composition resin comprising: polyethylene (PE), polypropylene (PP), and ethylene-vinyl acetate (EVA) copolymer having a vinyl acetate (VA) content of 8-33%; comprehensive mixture comprising, main crosslinking agent, antistatic agent, titanium dioxide nanoparticles and titanium dioxide microparticles; auxiliary crosslinking agent; lubricant; antioxidant; UV absorber; filler; and optionally colorant.    USE - For producing weather-resistant crosslinked polyolefin sheet (claimed) used as a weather-resistant polyethylene vinyl acetate (PEVA) film for use on the back panel of a solar cell, or as other industrial films requiring high weather resistance.    ADVANTAGE - The weather-resistant crosslinked polyolefin composition is suited to produce a weather-resistant crosslinked polyolefin sheet with a calender machine instead of an extruder conventionally used; enables a low processing cost and high production speed. The produced polyolefin sheets are excellent in both heat-resistant and weather-resistant as well as in a high-quality sheet surface and are capably made at a high yield rate through the calender machine; is resistant to creep or plastic deformation; has high-quality sheet surface free of scorch marks, fisheyes or like defects.    DETAILED DESCRIPTION - A weather-resistant crosslinked polyolefin composition, suitably processed by a calender machine to produce a weather-resistant crosslinked polyolefin sheet, comprises: 100 PHR (parts per hundred resin) of a polyolefin composition resin comprising: 20-50 PHR polyethylene (PE), 30-60 PHR polypropylene (PP), and 0.1-30 PHR ethylene-vinyl acetate (EVA) copolymer having a vinyl acetate (VA) content of 8-33%; 0.1-35 PHR comprehensive mixture comprising, based on its total comprehensive mixture weight, 0.1-3 wt.% main crosslinking agent, 0.1-1.5 wt.% antistatic agent, 0.1-1.5 wt.% titanium dioxide (TiO2) nanoparticles and 94-99.7 wt.% TiO2 microparticles; 0.01-2 PHR auxiliary crosslinking agent; 0.1-15 PHR lubricant; 0.1-5 PHR antioxidant; 0.1-3 PHR UV absorber; 0.1-30 PHR filler; and optionally 0-35 PHR colorant. INDEPENDENT CLAIMS are included for the following:    (1) producing (M1) a weather-resistant crosslinked polyolefin sheet produced through a calender machine involving: adding 0.1-3 wt.% main crosslinking agent, 0.1-1.5 wt.% antistatic agent, 0.1-1.5 wt.% TiO2 nanoparticles and 94-99.7 wt.% TiO2 microparticles, and mixing the ingredients evenly in a kneader at a low temperature to produce a comprehensive mixture; mixing 100 PHR polyolefin composition resin, 0.1-35 PHR the comprehensive mixture, 0.01-2 PHR auxiliary crosslinking agent, 0.1-15 PHR lubricant, 0.1-5 PHR antioxidant, 0.1-3 PHR UV absorber and 0.1-30 PHR filler in a mixer to evenly mixed as a resultant mixture, and introducing the mixture into another kneader for further mixing; allowing the mixture of second step at 150-220 degrees C to proceed a preliminary gelation and crosslinking through a mixing roll; introducing the uniformly gelled mixture of third step to a calender machine controlled at 170-200 degrees C for calendering to produce a hot-melted sheet whose thickness is controlled at 0.05-1 mm; embossing the hot-melted sheet of fourth step with an embossing apparatus, if necessary; and introducing the hot-melted sheet to a cooling roller set to cool the hot-melted sheet and fix its shape, and rolling up the cooled sheet as a finished product; and    (2) a weather-resistant crosslinked polyolefin sheet made by the method (M1).