Gravity self-locking type modular steel structure connecting joint and construction method thereof

The invention discloses a gravity self-locking type modular steel structure connecting joint and a construction method thereof, and the connecting joint comprises a steel wedge body which is 7-shaped. The upper corner fitting is welded to the lower end of the upper module column, the lower corner fitting is welded to the upper end of the lower module column, the steel wedge body is placed in a specific limiting insertion hole of the lower corner fitting and a perforated module column wall plate, and due to the existence of an inclination angle and a limiting structure, the steel wedge body can be kept at a corresponding limiting position. The module unit is hoisted and descended in the specific direction in the installation process, the steel wedge body can move along the limiting hole groove after being correspondingly acted until the module unit is completely installed at the corresponding position, then the steel wedge body slides downwards along the inclined hole groove under the action of the gravity of