The utility model belongs to the technical field of extrusion forming equipment, specifically disclose a slab band forming die, including cope match -plate pattern and lower bolster, be equipped withthe die cavity in the lower bolster. All be equipped with the vacuum cavity in cope match -plate pattern and the lower bolster, the vacuum cavity is external to have the suction opening, and one sideequipartition that the vacuum cavity is close to the die cavity has a plurality of vacuum mouth, vacuum mouth and die cavity intercommunication. The left and right sides equipartition of cope match -plate pattern and lower bolster has a plurality of water filling ports, all be equipped with in cope match -plate pattern and the lower bolster with the circulating pipe way of water filling port intercommunication, the circulating pipe of lower bolster says and says the level setting with the profile phase of die cavity with the circulating pipe of, cope match -plate pattern. This scheme receivesthe problem that inhomogeneous cooling is even when solving the slab band shaping.