The utility model discloses a limiting tool component for butting two overall sections in shipbuilding, which is combined with a first element and a second element. Wherein, all the elements comprise upright channel steel and upright reinforcing toggle plates which are arranged at the lower parts of the channels of the channel steel; the bottom surfaces of the reinforcing tollgate plates and the bottom surfaces of the channel steel are on the same plane, and are fixed on the surface of a ship deck. In addition, a horizontal bar is welded fixedly on a straight surface at the upper part of one upright channel steel which is vertical to the channel steel. The length of the horizontal bar is the same with that between the checking lines after two overall sections are butted. The tool component is used to control the limiting of the butting position of the two overall sections in shipbuilding, and has the advantages of convenient operation and higher butting efficiency.