The invention discloses a simple hot forming die and method for a large inner hole flanging of a high-strength titanium-alloy material. The simple hot forming die for the large inner hole flanging of the high-strength titanium-alloy material comprises an upper die base, a male die, discharging screws, an edge pressing ring, positioning pins, a lower die and hoisting screws, wherein the male die is fixed to the upper die base, the edge pressing ring is hoisted to the upper die base through the discharging screws, and the discharging screws can move up and down in the upper die base. The die is fixed in a hot forming pressure machine and is heated to the forming temperature required by the technology, a blank to be formed is flat placed on the lower die base, an upper platform moves downwards to achieve die assembly, the edge pressing ring makes contact with the blank firstly, the upper platform moves downwards continuously, a material in a deformation area is pressed in a lower die cavity gradually by the male die, and then the flanging is formed. The die and method are suitable for simple hot forming of flangings of metal materials such as high-strength titanium alloy.