Height-adjustable mounting structure of stiff structural steel column

The invention discloses a stiff structure steel column height-adjustable mounting structure which comprises column foot supporting legs, a support top regular hexagon bearing, a mounting beam and a stiff structure steel column which are sequentially arranged from top to bottom, and the column foot supporting legs comprise six angle steel supporting legs and six supporting leg reinforcing angle steel. Each supporting leg reinforcing angle steel is arranged on the inner side of the corresponding angle steel supporting leg, and each angle steel supporting leg is connected with the corresponding supporting leg reinforcing angle steel through an arranged height adjusting device. The height adjusting device comprises fixing plates, fixing blocks, screw rods, nuts, limiting plates, transmission belt-shaped components and transmission wheel-shaped components, each angle steel supporting leg is fixedly connected with two fixing plates, the transmission wheel-shaped components are arranged between the two fixing plates