Roof flashing one-step forming die

The utility model relates to a roof flashing one-time forming die, which belongs to the technical field of building construction and particularly comprises an arc-shaped plate, side plates are respectively mounted on two sides of the arc-shaped plate through quick connecting components, and a first right-angle connecting plate and a second right-angle connecting plate are respectively mounted at the top and the bottom of the arc-shaped plate. Connecting holes are formed in the first right-angle connecting plate and the second right-angle connecting plate respectively, the first right-angle connecting plate and the second right-angle connecting plate are used for being fixed to a wall and a roof, a pouring notch is formed in the first right-angle connecting plate, and the pouring notch is used for pouring concrete into a cavity formed by the arc-shaped plate and the side plate; the flashing board forming device is simple in structure, convenient to use, capable of rapidly forming a flashing board and high in c