Connecting structure in steel structure

The utility model discloses a connecting structure in a steel structure. The connecting structure is positioned on a contact surface of two connecting steel materials for forming a dismountable connecting structure between the steel materials, one side of one steel material in the two steel materials outwards extends for forming a connecting arm, the connecting arm is overlapped with the end part of the other steel material, and is provided with a plurality of through holes, each through hole is matched with a screw bolt for forming a connecting structure, and a positioning structure is arranged between the end part of the other steel material and one side of the corresponding steel material, so that a connecting framework with a positioning structure is formed. A positioning and pre-fixing structure is adopted for ensuring the realization of the positioning and the fixation between the steel materials before the screw bolt fastening, the accurate connection between the steel materials is ensured, and further, the safety and the stability of the steel structure are ensured.