The invention discloses a low-temperature rapidly cured acrylic ester modified epoxy resin joint sealant used in roads and bridges. The joint sealant comprises a component A and a component B, wherein the component A comprises 55 parts of bisphenol F diglycidyl ether, 10-12 parts of graft polymerized epoxy resin and acrylic copolymer and 33-60 parts of an acrylic monomer; the component B comprises 5-15 parts of modified 1,3-cyclohexanediamine and 30-45 parts of modified hexamethylenediamine; the joint sealant is prepared by respectively stirring and mixing the component A and the component B, mixing the two components in the mass ratio of 100:(90-100), uniformly stirring, adding 1-5 parts by mass of an accelerant diacyl organic peroxide into the mixed liquid, and further stirring. The joint sealant disclosed by the invention is high in binding strength, has the characteristic of excellent aging resistance, low flexibility, low viscosity, high interface binding force, secondary fatigue cracking resistance and the like, and can be used in joint sealing construction all year around.