The invention discloses a 810MPa grade high-performance weather resistant bridge steel composite welding seam liner pasting single welded butt method and belongs to the technical field of large-span and heavy-load high-strength high tenacity high weatherability bridge steel welding. The key point of the technical scheme of the 810MPa grade high-performance weather resistant bridge steel compositewelding seam liner pasting single welded butt method is that the mechanical performance characteristics of a base material of bridge steel with tensile strength of larger than or equal to 810 MPa arethat the yield strength ReL is larger than or equal to 690 MPa, the tensile strength Rm is larger than or equal to 810 MPa, the elongation percentage A is larger than or equal to 14%, and the impact power KV2 at -40 degrees centigrade is arger than or equal to 120 J; a groove adopts a single-face V-shaped groove, the groove angle is 40 degrees, and the clearance is 6 mm; and clamp plates are adopted to be assembled first, a ceramic liner is arranged on the back surface of the clearance, a joint is primed for three layers by using gas shielded welding, and then submerged arc welding filling andcovering are carried out. According to the 810MPa grade high-performance weather resistant bridge steel composite welding seam liner pasting single welded butt method, by using a composite welding ceramic liner pasting single welded butt method, the groove dimension is 40 degrees, the welding seam deposited metal filling quantity is reduced, the range of a heat-affected zone of a welding seam isreduced, and the performance of a joint is improved; and 810MPa grade high-performance weather resistant bridge steel is realized, the 810MPa grade high-performance weather resistant bridge steel is preheated to 80-100 degrees centigrade before being welded, the 810MPa grade high-performance weather resistant bridge steel is not heat-treated after being welded, and therefore, the molding of the obtained welding seam is good.