The invention discloses a modified compounded rubber sealing gasket material. The modified compounded rubber sealing gasket material is characterized by being prepared from the following raw materials in parts by weight: 70-75 parts of tetrafluoroethylene-propylene rubber, 18-23 parts of silicone rubber, 1-2 parts of calcium hydroxide, 2-4 parts of magnesium oxide, 28-32 parts of N550 carbon black, 1-2 parts of sulphur, 1-2 parts of accelerant DM, 2-3 parts of zinc oxide, 2-4 parts of potassium citrate, 1-2 parts of 2,2',3,3',4,4',5,5',6,6'-decabromobibenzyl, 1-2 parts of acrylonitrile, 3-5 parts of methyl methacrylate, 1-2 parts of 3-aminopropyltrimethoxysilane, 0.5-1 part of crosslinking agent TAC, 16-20 parts of nanometer celestite powder and 10-12 parts of modified attapulgite. The processing property of the rubber material is improved by adding the modified attapulgite; the toxic and side effects and the pollution to environments of the rubber material are reduced by using an environmentally-friendly compounding agent; the modified compounded rubber sealing gasket material has good combination property and is long in service life; the mechanical property, the oil resistance, the ageing resistance and the like of the modified compounded rubber sealing gasket material are improved.