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This utility model discloses a high-pressure orifice plate throttling device for separating sulfur hexafluoride gas, relating to the field of orifice plate throttling technology. It includes a connecting flange and a throttling ring. An orifice plate is disposed inside the throttling ring, and a movable plate is rotatably connected inside the throttling ring. A groove is formed on one side of the movable plate, and a slider is slidably connected to one side of the groove. An orifice plate is fixedly connected to one side of the slider, and a connecting block is fixedly connected to one side of the movable plate. A fixing block is fixedly connected to the outside of the throttling ring, and a connecting hole is formed inside the fixing block. This utility model, through the arrangement of the movable plate, groove, slider, orifice plate, and connecting block, achieves the effect of controlling the throttling flow rate. The cooperation of the limiting rod and the movable groove guides the movement of the orifice plate during use, thereby adjusting the throttling flow rate and achieving the purpose of adjusting the flow rate of the throttling device.