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The utility model discloses an overline spliced bridge based on a prefabricated UHPC-T beam structure. The overline spliced bridge comprises T beams, steel cross beam components, shear key components and transverse prestressed tendons. The bottom of the T-beam is arranged on an abutment through a bridge support and comprises a web plate and a wing plate; the steel cross beam component is used for connecting and fixing the adjacent T beams, so that the adjacent T beams are connected into a whole to improve the structural strength and stability, the steel cross beam component comprises a pre-buried connecting seat pre-buried in a web and a steel cross beam, and the two ends of the steel cross beam are fixed to the pre-buried connecting seat of the adjacent T beams through high-strength bolts; the shear key component comprises key teeth and key grooves which are arranged on the two sides of the wing plate, and the key teeth of the adjacent T beams are embedded in the key grooves. The transverse prestressed tendons penetrate out of the wing plates to be tensioned, and the multiple T-beams are connected into a whole. According to the overline spliced bridge, the modularized UHPC-T beams are adopted, the structural height is reduced by means of the ultrahigh mechanical property of UHPC, and the overline spliced bridge adapts to the condition that the clearance under the bridge is limited; the shear keys are matched with the steel cross beams to replace a traditional cast-in-place wet joint and cross beam technology, old bridges do not need to be dismantled, the longitudinal section of a road does not need to be lifted, and the construction period is remarkably shortened.