Reinforcing device and method for fabricated building door-shaped component

According to the reinforcing device and method for the fabricated building door-shaped component, the device comprises a positioning plate and two supporting rods, the ends of the supporting rods support the inner wall of the door-shaped component, and the middles of the two supporting rods are hinged together through a pin shaft fixed to one side of the positioning plate; the positioning plate is provided with a transmission block sliding in the length direction of the positioning plate and a driving assembly driving the transmission block to slide. The driving assembly controls the transmission block to slide in the direction of the intersection point of the two supporting rods, and the transmission part makes contact with the side walls of the supporting rods in the sliding process to drive the two supporting rods to rotate in the opposite directions, so that the intersection angle of the intersection area where the transmission part is located becomes larger, and the inner wall of the door-shaped componen