Marking pliers for forest investigation and use method

The invention discloses marking pliers for forest investigation and a using method. The marking pliers comprise a first pliers body and a second pliers body, wherein the first pliers body and the second pliers body are movably connected with a pin through a rotary connecting piece, and the marking pliers further comprise a marking head, a wide groove, a narrow groove, a sliding strip, a pressing structure, a limiting baffle, a spring, a first handle, a movable handle, a stress application cylinder, a second handle and a frame-shaped seat structure; the limiting baffle blocks the side edge of a marking plate, and one end of the stress application cylinder sleeves the outer end of the movable handle. According to an existing marking pliers structure, problems that when the marking plate is marked, if the marking plate is marked for multiple times, marks are not neatly arranged on the marking plate, and the marking is difficult to complete only by manually adjusting and aligning by a user, and when the surfaces