The invention discloses an irradiation-crosslinked power cable material for converters, which is made from, by weight, 35-42 parts of superfine acrylate rubber powder, 40-54 parts of chlorinated polyethylene elastomer, 30-45 parts of vinyltrimethoxysilane, 65-86 parts of aluminum hydroxide, 12-16 parts of wollastonite powder, 15-20 parts of dicetyl peroxydicarbonate, 10-18 parts of phosphites, 2-5parts of zinc borate micropowder, 5-8 parts of dinonyl-cyclohexane-1,2-dicarboxylate, 2-5 parts of benzotriazole, 3-7 parts of lead sulfate tribasic, 3-5 parts of glycerol monostearate, 7-12 parts ofchlorinated paraffin, 4-10 parts of tetrapod-like vinyltrimethoxysilane whiskers, 3-6 parts of decabromodiphenyl ether, 2-3 parts of semi-reinforced carbon black, 3-6 parts of an aid, and 8-12 partsof a plasticizer. The cable material prepared via the simple easily-operable radiation-crosslinking preparation method has good corrosion resistance and flame retardance.