Fabricated steel structure with stable connecting assembly

The utility model relates to the technical field of steel structure connection, in particular to an assembly type steel structure with a stable connecting assembly, a connecting device comprises two clamping grooves, two clamping blocks are fixedly installed on the surface of a prefabricated steel plate, two positioning holes are formed in the surfaces of the two sides of the prefabricated steel plate, and sliding rods are fixedly installed on the surfaces of the two ends of an I-shaped steel connecting plate. Two positioning rods are fixedly installed on the surface of the sliding plate, the ends, away from the sliding plate, of the positioning rods are located in the positioning holes, a handle is fixedly installed on the surface of the end, away from the positioning rods, of the sliding plate, and a limiting plate is fixedly installed on the surface of the end, away from the I-shaped steel connecting plate, of the sliding rod; a spring is fixedly installed between the limiting plate and the sliding plate.