Rail clamping device

The utility model discloses a rail clamping device, which comprises a box body fixed at the foot part of a portal crane and provided with a box door with a lock, and is characterized in that the box body is divided into an upper layer and a lower layer through a partition plate, a power device is fixed at one side of the partition plate at the upper layer, a jack is fixed at the other side of the partition plate, and an input shaft is fixed at the input end of the jack; a bearing is arranged in the middle of the input shaft, a bearing seat of the bearing is fixed to the partition plate, a driven wheel is arranged outside the input shaft and connected with a driving wheel of the power device through a transmission belt, the end of a transverse rod is hinged to the side wall of the box or the side wall of the power device, and the other end of the transverse rod is hinged to the output end above the jack. A transmission rod is arranged on a middle shaft of the box body and penetrates through the partition plate