The invention discloses an insulation material used for a shell of an automotive relay. The insulation material is composed of, by weight, 100-130 parts of epoxy resin E40, 1-2 parts of magnesium stearate, 0.8-1 part of diphenylimidazoline, 2-3 parts of vinyl succinic anhydride, 1-2 parts of nickel aminosulfonate, 0.6-1 part of trimethylbenzyl ammonium chloride, 10-12 parts of methyl acrylate, 0.04-0.1 parts of ammonium persulfate, 0.01-0.02 parts of divinyl benzene, 10-14 parts of nano silicon dioxide, 0.1-0.3 parts of coconut diethanolamide, 7-11 parts of aluminum hydroxide, 30-40 parts of polyethylene, 7-10 parts of pottery clay, 1-2 parts of paraffin, and 0.2-0.4 parts of acetylacetone calcium. In the invention, with the methyl acrylate as a monomer and the ammonium persulfate as an initiator, the diphenylimidazoline is added so that a polymerized alcohol liquid has certain anti-corrosion performance; and then the divinyl benzene is employed a crosslinker, wherein during the crosslinking process, a nano silicon dioxide dispersion liquid is added for modification, so that the prepared nano modified filler has high strength and toughness, and also has excellent compatibility with epoxy resin, thus producing the high-performance epoxy insulation material.