The utility model discloses a telescopic bracket. The device comprises a main beam, a vertical inclined strut and an anchoring mechanism, the anchoring mechanism is used for being installed at the topof a suspension bridge transition pier. The first end of the main beam is hinged to the anchoring mechanism. The main beam can be switched between a retraction state perpendicular to the anchoring mechanism and close to the side wall of the suspension bridge transition pier and an extension state that the top surface of the main beam is flush with the top surface of the anchoring mechanism. the second end of the main beam is hinged with the first end of the vertical inclined strut; the second end of the vertical inclined strut is used for being detachably connected with the side wall of the suspension bridge transition pier, and the vertical inclined strut can be switched between a retraction state in which the vertical inclined strut is disconnected from the side wall of the suspension bridge transition pier and is parallel to the main beam and an extension state in which the vertical inclined strut is connected with the side wall of the suspension bridge transition pier and is inclined to the main beam. By means of the telescopic bracket, the steel box girder can be temporarily supported, the erecting and dismantling construction period is short, and use is flexible, convenientand fast. The utility model further discloses steel box girder hoisting equipment.