The present invention relates to a lead accumulator epoxy resins sealant and preparation method thereof, particularly a cementing compound used on lead acid batteries sealing and adhesive bonding. The lead accumulator epoxy resins sealant includes A component and B component, the mass portion proportioning between A component and B component is as following: A:B = 2:1, wherein the raw material mass proportioning of A component is as following: bisphenol A epoxy resins 70-80, bisphenol F epoxy resins 10-15, butyl glycidyl ether 3-5, 2-methylphenol glycidyl ether 8-12, polyurethane 5-8, resin acceptor 0.1; and the raw material mass portion proportioning of B component is as following: aniline 400, polyoxymethylene 70-76, aminic acid 30, water 100-300, benzenemethanol 300-500, anti-oxidant 2, cure accelerator 20-35, and nonyl phenol 60.