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This invention discloses a dismantling device and method for the substructure of a bridge, belonging to the technical field of bridge dismantling equipment. It includes self-locking casters, a lifting platform, a support platform, a support panel, an insertion device, a rotating device, a drilling device, a top-support device, a release device, a transmission device, and a removal device. The insertion device and the rotating device are mounted on the support platform. The drilling device is connected to the insertion device. Two top-support devices are symmetrically arranged on the support panel. The release device and the removal device are both mounted on the support panel. The transmission device is also mounted on the removal device. This device provides a convenient method for dismantling square timber and back bracing by using screws or similar methods to limit their position on the side of the bridge abutment. By saving time and effort and releasing most of the required pulling force to the ground, the stability and operational efficiency of this device are improved.