Tool of quickly detecting unevenness of steel plate

The invention discloses a tool of quickly detecting the unevenness of a steel plate. The tool comprises a horizontal ruler with scales. The horizontal ruler comprises a left horizontal ruler and a right horizontal ruler that is movably disposed inside the left horizontal ruler. An adjusting mechanism I for adjusting the length of the horizontal ruler is disposed between the left horizontal ruler and the right horizontal ruler. The horizontal ruler is provided with a displacement detection device that can slide along the length of the horizontal ruler. The two ends of the horizontal ruler are each provided with a supporting rod. Each supporting rod includes an upper supporting bar and a lower supporting bar that is movably arranged inside the upper supporting bar, the end portion of the lower supporting bar is provided with a sucker, and an adjusting mechanism II for adjusting the height of the supporting rod is arranged between the upper supporting bar and the lower supporting bar. The tool has a simple structure, is convenient to use, can accurately measure the specific value about the unevenness of a steel plate, also can measure a steel plate in a non-standard situation, is more widely applicable, and is more user-friendly.