Fabricated building steel structure connecting device

The utility model discloses an assembly type building steel structure connecting device which comprises a middle connecting frame beam, a limiting cover plate is fixed to the connecting portion of the inner concave side wall of the middle connecting frame beam, and a limiting groove for limiting the end of a connecting beam is formed in the limiting cover plate. And two concave cavities are symmetrically formed in the positions, located on the two sides of the limiting cover plate, in the middle connecting frame beam. The utility model has the beneficial effects that on one hand, reliable limiting of the plug after being inserted on the connecting cross beam can be realized under the matching of the cross rotating head, the thread part and the locking screw groove, and on the other hand, the left-right swinging of the connecting cross beam in the transverse direction can be effectively limited under the inserting and fixing of the connecting cross beam and the limiting groove in the limiting cover plate; by m