A powered nail-driving tool includes a striking rod disposed in a shell and thrust into a feeding region of a nail-discharging passage in a barrel along an impact line to force a leading nail of a selected one of ranks of nails oriented along different lines of inclination. A nail magazine has a nail-feeding channel for accommodating the selected rank of nails. A linking arm is secured to a leading edge wall of the magazine, and is pivotally mounted on the barrel such that the magazine is turnable so as to permit the inclination line of the selected rank to align with the impacting line. Thus, the tool can be used for driving different ranks of nails.