The utility model belongs to the technical field of construction of prestress concrete continuous beams in bridge construction, and particularly relates to a modular tie bar arch supporting frame of a bridge location cast-in-place prestress concrete beam. The modular tie bar arch supporting frame of the bridge location cast-in-place prestress concrete beam resolves the problem that all structural rods of the tie bar arch supporting frame can not be used repeatedly. The modular tie bar arch supporting frame of the bridge location cast-in-place prestress concrete beam is shaped like an isosceles trapezoid and comprises inclined legs serving as two inclined sides of the isosceles trapezoid, an auxiliary beam serving as the upper bottom of the isosceles trapezoid and a tie bar serving as the lower bottom of the isosceles trapezoid, the auxiliary beam is hinged to the inclined legs, vertical inclined supports are hinged between the two ends of the auxiliary beam and the inclined legs, each inclined support, the corresponding inclined leg and the auxiliary beam form a triangular structure, and the tie bar is hinged to the inclined legs. A pier bearing platform and a pile foundation under the pier bearing platform are fully used as a lower bearing structure, and the ground foundation does not need to be reinforced. Cast-in-place construction of the concrete beam in a special external environment like an existing bridge can be realized.