Steel structure box roof frame

The utility model discloses a steel structure box roof frame which comprises a box roof frame body and stand columns, angle seats are fixedly arranged at the positions, corresponding to the stand columns, of the box roof frame body, installation cylinders are fixedly arranged at the top ends of the stand columns, inserting rods extending into the installation cylinders are integrally fixed to the bottom ends of the angle seats, and a plurality of inwards-concave locking grooves are formed in the outer wall faces of the inserting rods. A rolling cavity is formed in the position, corresponding to the locking groove, of the cylinder wall of the mounting cylinder, an adjusting mechanism is arranged on the outer side of a cylinder body of the mounting cylinder, the rolling cavity is a spherical cavity with two notches, a spherical locking ball is movably mounted in the rolling cavity, the locking ball protrudes out of the rolling cavity at least from one notch of the rolling cavity, and the adjusting mechanism is