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This invention provides a method for fabricating precast box girder tracks for highways, belonging to the field of track fabrication technology. The method includes the following steps: S1: Concrete preparation, where screened cement, crushed stone, and sand are mixed according to a concrete mix design to obtain castable concrete; S2: Steel frame preparation, where steel bars and prestressed steel strands are combined after ensuring the materials are qualified to obtain a precast steel frame; S3: Concrete pouring, where the concrete pouring equipment includes a steel frame conveying mechanism for positioning and conveying the steel frame, a pouring mold for placing the steel frame for positioning and pouring, a demolding mechanism for quickly demolding the formed precast beam, and a moving pouring mechanism for uniform pouring; S4: Demolding and curing, where the precast beam is cured using curing equipment, ensuring that after the concrete pouring is completed and the slurry has settled, it is covered and watered for curing as soon as possible; S5: Finishing work. This invention facilitates rapid demolding of precast beams, achieving efficient demolding.