The invention relates to an eye-protecting device used in laser machining device, which comprises a LCD glass screen (9), lead wires (10), and impulse signal processing circuit (11); wherein, the LCD glass screen (9) is connected to the output interface of impulse signal processing circuit (11) via lead wires (10). It is characterized in that: the input interface of said circuit is connected to the output impulse signal of laser power resource. When in working, LCD glass screen (9) is at the view that watching the laser machining process of work-piece. The invention has eye-protecting function. |