Molten iron tank cover

The invention discloses a molten iron tank cover. A heat preservation cover and a supporting structure are included. The supporting structure comprises supporting frames, supporting bases and hydraulic oil cylinders. The two supporting frames are arranged and arranged on the right edges of the front side and the rear side of a molten iron tank and are each of a V-shaped structure. The two ends ofthe upper portion of each supporting frame of the V-shaped structure are connected to the right edge of the front side or the right edge of the rear side and the right side of the heat preservation cover correspondingly, wherein the lower portion is movably connected to the top end of the corresponding supporting base. The supporting bases are arranged on the front side or the rear side of a molten iron tank vehicle. First fixing blocks are oppositely fixedly arranged at the lower portions of the right sides of the supporting bases, and opposite holes are formed in the two first fixing blocks.Second fixing blocks are