The invention discloses a stainless steel plate alignment welding device for angle iron production. The stainless steel plate alignment welding device for angle iron production comprises a shell, theshell is hollow, the lower end of the shell is connected with a foot pad through a supporting column, the side wall of one side of the shell is provided with a feeding opening communicating with the interior, a cover plate is rotatably connected to an opening of the feeding opening, a welding gun is connected to the inner wall of the upper side of the shell through a mechanical arm, a storage plate is in sliding connection into the shell through a moving device, two sets of fixed plates are symmetrically arranged on the upper side wall of the storage plate, air cylinders are fixedly connectedto the side walls of the fixed plates, and output ends of the air cylinders are connected with piston rods. A steel plate material is fixed firmly, operation is easy, work efficiency is improved, thedevice welding process is performed in the shell, splashes cannot fly out of the shell, through a sucking pump, waste gas and the splashed generated in the welding process can be sucked and collected,body health of a worker is protected, and safety performance of the device is improved.