Steel column verticality detection tool

The utility model provides a steel column verticality detection tool. Comprising a ruler body, a connecting rope, a plumb bob, a fixing mechanism and a horizontal mechanism, a plurality of horizontal scales are arranged on the ruler body, a supporting column is arranged at the top of the ruler body, the connecting rope is fixed to the supporting column, the plumb bob is fixed to the bottom end of the connecting rope, and the connecting rope is perpendicular to the horizontal scales. The fixing mechanism is arranged on one side of the ruler body, and magnets in rows are arranged in the fixing mechanism; the horizontal mechanism comprises a bouncing positioner, a horizontal ruler and a baffle plate; a round hole is formed in the other side of the top of the ruler body, and the positioner is fixed in the radial direction and can jump along the round hole; the baffle is fixed to the round hole and blocks the positioner, and the positioner penetrates through the round hole. The horizontal ruler is buckled on the p