The utility model discloses a communication signals detection device, including communication signals appearance body and rectangle box body, install the sliding seat on the rectangle box body, install the adjustable shelf in the sliding seat, a pair of slide rail of installation is a pair of in the rectangle box body install the slider on the slide rail, articulated a pair of movable rod on the slider, it has a pair of spread groove to open on the adjustable shelf, and be a pair of the movable rod is installed in the spread groove respectively, install the cassette on the adjustable shelf, communication signals appearance body is settled on the cassette, install the spring beam on the rectangle box body, join in marriage the shock mount on the spring beam, install the ejector pad on the spring beam, the ejector pad is connected with the slider. The utility model discloses can can not lose the protection when using the communication signals appearance, reduce and remove the communication signals appearance, can carry out angle regulation according to user's needs simultaneously, the person's of facilitating the use operation.