Rail transit calcined welding sealant and preparation method thereof

The invention discloses a rail transit calcined welding sealant and a preparation method thereof, and the sealant comprises the following raw materials by mass: 80-120 parts of a silane modified polymer, 60-100 parts of a plasticizer, 150-210 parts of a modified filler, 2-10 parts of a thixotropic agent, 0.5-3 parts of an anti-ultraviolet agent, 0.5-3 parts of a light stabilizer, 0.5-3 parts of a heat stabilizer, 3-6 parts of a water removal agent, 3-6 parts of a silane coupling agent, 3-7 parts of a curing agent, and 6-12 parts of a silane oligomer. And the silane oligomer is an epoxy amino silane oligomer. The silane modified polymer can form a cross-linked network structure which takes a silicon-oxygen-silicon bond as a cross-linking point and is connected by a flexible polymer long chain, the silane oligomer can increase the cross-linking density of the sealant, silicon hydroxyl contained in the sealant and active groups in the silane oligomer can form chemical connection with a base material, and the bon