Fabricated integrated connecting device for building equipment and connecting method

The invention relates to the technical field of building equipment connecting accessories, in particular to an assembly type integrated connecting device for building equipment and a connecting method. The number of the arc-shaped rotating pieces is four, the bottom plate is of a rectangular structure, the arc-shaped rotating pieces are evenly arranged above the bottom plate around the center position of the bottom plate, and even meshing teeth are arranged on the arc-shaped circumferential walls of the arc-shaped rotating pieces. The rack is slidably arranged on the bottom plate, and the upper portion of the rack is meshed with the arc-shaped rotating piece. The elastic pushing assembly is arranged above the arc-shaped rotating piece; the pushing block is arranged at one end, close to an extension line of the center position of the bottom plate, of the elastic pushing assembly; the two sides of the transmission assembly are connected with the elastic pushing assembly and the rack correspondingly, rapid insta