Long workpiece lifting device

The utility model provides a long workpiece lifting device, and belongs to the technical field of machinery. The problem that an existing device has potential safety hazards is solved. The long workpiece lifting device comprises a support and two mounting plates which are horizontally arranged in parallel and used for mounting clamps, the two mounting plates are both in sliding connection with the support, racks are vertically arranged above the two mounting plates, and the lower ends of the racks are fixedly connected with the corresponding mounting plates; transmission shafts are horizontally arranged on one sides of the two racks, and the axes of the transmission shafts extend in the arrangement direction of the two mounting plates; a speed reducer with a self-locking function is arranged between the two transmission shafts and comprises two output shafts, and the central axes of the two transmission shafts and the two output shafts are collinear; the two adjacent ends of the two transmission shafts are co