The invention relates to a flange connection type joint of a built-in-connecting-piece hollow prism and H-shaped rod pieces, and belongs to the technical field of connection joints. The flange connection type joint comprises an upper joint plate and a lower joint plate, a hollow prism, a plurality of rod pieces, a plurality of connecting pieces and a plurality of fasteners. The hollow prism is connected with the rod pieces through the connecting pieces, and the rod pieces are connected with the upper joint plate and lower joint plate through the flanges. Due to the existence of the middle hollow prism, a part of the force of the joint is borne by the hollow prism during the compression process, the stress on the rod pieces is reduced, meanwhile, due to the hollow prism, the connection between the rod pieces is further improved, so that the stress on the rod pieces is more uniform. And due to the reduction in the number of the fasteners connecting the flanges of the rod pieces and the joint plates, the weakening of bolt holes to the rod pieces and the joint plates is reduced under the condition of bending and tension; and meanwhile, since the connecting pieces are connected to the inside of the hollow prism, when the rod pieces are pulled, the facade of the prism can also bear part of the tensile force, compared with common plate joints, and thus the flange connection type jointimproves the bending and tensile bearing capacity of the prism.