<p>A tower body (1) of an iron tower is formed by connecting a plurality of trapezoidal tower sections (2). Each trapezoidal tower section (2) has a different gradient, so that an outer contour line of the tower body (1) is a multi-fold line formed of a plurality of line segments; the multi-fold line approximately is a quadratic curve, and the quadratic curve is consistent with a bending-moment curve of the iron tower under the effect of horizontal load.</p>
