Suspension insulator applied to overhead circuit and fabrication process of suspension insulator

The invention discloses a suspension insulator applied to an overhead circuit and a fabrication process of the suspension insulator. The suspension insulator comprises an insulation piece, a steel leg and a steel cap, wherein the insulation piece comprises the following raw materials based on parts: 65 parts of flexible epoxy resin, 35 parts of nanometer silicon dioxide, 15 parts of polycarbonate resin, 6 parts of glass fiber, 1-5 parts of cationic type polyacrylamide, 2-6 parts of ammonium molybdate, 2-7 parts of polyethylene, 4-8 parts of organic silicon resin, 10-15 parts of carbon black, 3-7 parts of aminopropyltriethoxysilane, 1-5 parts of polymeric aluminum sulfate silicate, 2-8 parts of polyolefin, 4-8 parts of tetrabutylammonium bromide, 1-5 parts of silicon hydroxide, 2-6 parts of ferric oxide, 0.5-2.5 parts of silicon carbide and 1.5-3.5 parts of N-ethyl-N-phenyldithiocarbamate, and the composition materials of the steel leg and the steel cap are zinc steel. The formula is reasonable, the fabricatio