An automatic shading electric welding lens comprises a view window (1) and a side frame (2). The view window (1) is composed of an optical filter and a liquid crystal sheet sequentially overlapped. The automatic shading electric welding lens is provided with an illuminating device. The illuminating device includes a lighting body (3), a switch (4) and a power supply (5) electrically connected to each other to form a loop. The lighting body (3) is arranged on a surface of the side frame (1) facing a welding object. The lighting body (3) is a light emitting diode. The switch (4) is a time-delay switch.
