The utility model discloses a unitized anti-deflection comb tooth type bridge telescopic device with the function of multidirectional displacement. The unitized anti-deflection comb tooth type bridge telescopic device with the function of multidirectional displacement comprises a first steel box beam, a second steel box beam and a cross seam plate. A fixed comb plate and a movable comb plate are arranged on the first steel box beam. One end of the cross seam plate is hinged to a fixed end mounting base on the end portion of the second steel box beam through a fixed elastic supporting seat and a fixed tension device, comb teeth are arranged in a mutual crossed mode at intervals between the movable comb plate and the fixed comb plate, the other end of the cross seam plate is hinged to the movable comb plate through a two-connecting-rod hinge, the cross seam plate is connected to a movable end mounting base on the end portion of the first steel box beam through a sliding elastic supporting seat and a sliding tension device, and the cross seam plate is hinged to the fixed end mounting base through a horizontal displacement prevention device. The unitized anti-deflection comb tooth type bridge telescopic device with the function of multidirectional displacement has the advantages that the comb teeth are not prone to being broken; the cross seam plate and the movable comb plate are separated left and right and do not affect each other; the sliding elastic supporting seat and the sliding tension device are combined, so that when a beam end is rotated, the cross seam plate and the elastic supporting seats correspondingly rotate; the horizontal displacement prevention device is provided, so that fixation of the cross seam plate in the direction of a bridge is strengthened.