The invention relates to a falling-off test device and a usage thereof. The falling-off test device comprises a fixing frame, a falling-off angle setting jig and a holder; the fixing frame is provided with a slide carriage which is equipped with a horizontal slide rail; the falling-off angle setting jig is arranged on the slide carriage and connected with a sampling rack for regulating hoisting and descending, the sampling rack is provided with a first reference plane, the jig is provided with a second reference plane, the motion of hoisting and descending of the sampling rack causes the first reference plane to move between a first setting position and a first withdrawing position, the jig moves horizontally under guidance of the horizontal slide rail, and the second reference plane moves between a second setting position and a second withdrawing position; and the holder holds the object to be tested. The invention is applicable to testing falling-off surfaces in different angles of the objects to be tested with different sizes, and can adjust the different test conditions.