The invention relates to the technical field of lifting, and provides a lifting device for steel plates. The lifting device comprises a screw and lifting nuts; threads on the screw is divided into twosections, namely right-hand threads and left-hand threads; the two ends of the screw are connected to the lifting nuts in a threaded mode; lifting rings are arranged at the top parts of the lifting nuts; rotating shafts are vertically arranged at the bottom parts of the lifting nuts; limiting blocks are arranged at the bottom ends of the rotating shafts; C-shaped clamps capable of rotating aroundthe rotating shafts and located above the limiting blocks are arranged on the rotating shafts; pressing plates are arranged at inner openings of the C-shaped clamps; and threaded shafts are arrangedon the pressing plates and are connected to the C-shaped clamps through threads in a matched mode. The lifting device for the steel plate has the advantages of being simple in structure, firm in fixation, convenient to operate, suitable for lifting the steel plates with different width and also suitable for lifting the steel plates with different thickness.