Disc connecting device

The utility model belongs to the field of steel structure connecting and fixing equipment, and particularly relates to a disc connecting device which comprises a first polygonal pipe. A disc is fixedly connected to the bottom of the first polygonal pipe, a second polygonal pipe is fixedly connected to the bottom of the disc, and rectangular connecting pipes are fixedly connected to the surfaces of the first polygonal pipe and the second polygonal pipe; through the structural design of the rectangular connecting pipes and the rectangular connecting plates, a person can insert a steel pipe cylinder into a space defined by the multiple rectangular connecting plates, so that the steel pipe cylinder can be fixed through the rectangular connecting plates, and then the person can conveniently use the top end of the steel pipe cylinder to support an object at a high position; and finally, personnel only need to insert the supporting rod piece into the rectangular connecting pipe and insert the fixing component into t