Lifting hook structure of portal crane

The utility model provides a lifting hook structure of a portal crane, which relates to the technical field of bridge cranes, and comprises a limiting mechanism, the limiting mechanism comprises a bridge frame, two screw rods are arranged in the top side of the bridge frame, one end of each screw rod is provided with a second motor, the outer surface of each screw rod is provided with a moving block, and the moving blocks are arranged on the top side of the bridge frame. A driving device is arranged at the top end of the moving block, and a rotating disc is arranged at the bottom end of the moving block. When the driving device is started to change the angle change of an object, the driving device drives the turntable to rotate, the steel wire rope and the hook synchronously drive the object to rotate, the steel wire rope is effectively limited through the limiting groove formed in the limiting plate, and the phenomenon that the steel wire rope is wound is avoided; meanwhile, the pulleys can prevent the steel