The invention relates to a duct piece connection joint with a stacked structure and a method for connection by the joint. The joint comprises a first connector and a second connector, the first connector is embedded into a first duct piece of two adjacent duct pieces, the second connector is embedded into a second duct piece of the two adjacent duct pieces and matched with the first connector, the first duct piece and the second duct piece relatively slide, and the second connector is clamped into the first connector, so that the first duct piece and the second duct piece are in butt joint. The first duct piece and the second duct piece are fixedly clamped by the first connector and the second connector of the connection joint, the second duct piece only needs to slide relative to the first duct piece in mounting, one-pass simple assembly is realized, time and labor are saved in mounting, assembly of the duct pieces can be accelerated, and construction time is saved.