The invention discloses a wear-resisting, heat-resisting and acid-alkali resistant modified rubber sealing element which comprises modified sulfonated polyethylene rubber, butadiene styrene rubber, diphenyl phosphoryl chloride, hydrobromic acid tripolycyanamide, sulfur, barium sulfate, low-density polyethylene, polystyrene, asbestos fibers, talcum powder, trioctyl trimellitate, dioctyl phthalate, phenolic resin, accelerants DM, accelerants M, lead oxide, magnesium oxide, stearic acid, vaseline, anti-aging agents NBC, auxiliaries and diphenyl ketone. The wear-resisting, heat-resisting and acid-alkali resistant modified rubber sealing element has excellent wear resistance, heat resistance and acid-alkali resistance.