Pipe piece connecting structure capable of adapting to large deformation and assembling device of pipe piece connecting structure

A duct piece connecting structure capable of adapting to large deformation and an assembling device thereof comprise a conveying unit, a surface treatment unit, a rotary adsorption unit, a temporary fixing unit and a moving unit, and after duct pieces are prefabricated, the conveying unit conveys the duct pieces to the position below the surface treatment unit; the surface treatment unit conducts air pressure dust and impurity removal treatment on the middle area of the inner wall of the duct piece, then the conveying unit conveys the treated duct piece to the position below the rotary adsorption unit, and the rotary adsorption unit sucks the duct piece conveyed by the conveying unit and rotates the duct piece to the designated installation angle. And then the moving unit moves the duct pieces with the adjusted angles to the designated mounting position, then the duct pieces are temporarily fixed to the mounting position, then the next duct piece is assembled, and in this way, the whole duct pieces are annula