Insulated oil-resistant sealing rubber and preparation method thereof

The invention discloses insulated oil-resistant sealing rubber. The insulated oil-resistant sealing rubber is prepared from the following raw materials in parts by mass: 40-80 parts of nitrile rubber, 20-60 parts of chloroprene rubber, 1-1.5 parts of an accelerant, 0.5-2 parts of sulfur, 0.8-3.2 parts of magnesium oxide, 4-5 parts of zinc oxide, 45-55 parts of carbon black, 2-4 parts of an anti-ageing agent, 2-3 parts of stearic acid and 10-15 parts of a plasticizer. The invention further discloses a preparation method for the rubber. The rubber has good processing performance, ageing resistance and oil resistance.