Abstract: A nailing gun applicable to oblique rowed nails of different specifications includes a nail box having its upper rear side pivotally combined with the head end of a muzzle to form a pivot and its intermediate portion combined with the arc-shaped guiding slot of the combining member of a handle. Thus, the nail box can be adjusted and positioned at a proper angle for loading oblique rowed nails of different specifications. The nail box has a U-shaped nail-guiding plate fitted in a nail head groove and having its upper end formed with an extending section extending upward and reaching the rear end wall of the muzzle. The extending section of the nail-guiding plate is able to guide oblique rowed nails to smoothly move in the interior of the muzzle whenever the nail box is adjusted at a slant angle for loading oblique rowed nails of different specifications.