The utility model relates to a filter performance detects anchor clamps for to await measuring the filter clamping in testing the wind channel, including solid fixed ring and changeover portion, reducing tubular structure that the changeover portion adopted the bore to reduce gradually, the changeover portion front end is equipped with and tests the outer folding edges who assembles mutually in the wind channel, and solid fixed ring suit is in the outer lane of changeover portion front end and be connected as an organic wholely with the changeover portion, and the examination filter that awaits measuring is installed to the small -bore end in changeover portion rear end. The utility model discloses take the design of even reducing, make the experimental amount of wind evenly change, can not produce stronger turbulent flow, avoid the influence test result, transition design avoids leading to the additional structure resistance of air turbulent flow production because of unexpected reducing gradually.