The invention discloses a mechanical device for bending flat iron for any radian. The mechanical device comprises an operation platform and an angle iron positioning stress baffle plate, wherein the angle iron positioning stress baffle plate is arranged at a part close to the edge of the operation platform; a positioning disc with a clamping groove is arranged below the right part of the angle iron positioning stress baffle plate; the positioning disc is hinged with the operation platform through a positioning bolt; the positioning bolt is also hinged with a stress rod; a rotating disc is hinged with the stress rod; a lifting operation platform bracket is arranged below the operation platform. The mechanical device is simple in structure, easy to operate, solid, durable, and flexible to move, not only is the labor saved, but also the working efficiency is improved, a finished product does not need to be purchased any longer, self processing is achieved, and labor and materials are saved. The construction and the security are ensured, meanwhile, the construction cost of company engineering is greatly lowered, and the market competitiveness of companies is improved.