The invention belongs to a pipeline structure assembly, in particular relates to a tee joint structure assembly with multiple gas-transportation and composite pipeline structures. The tee joint structure assembly comprises a containing pipeline, wherein an air supplying pipeline, an emptying pipeline and an internal support structure are arranged in the containing pipeline, each air supplying pipeline and the emptying pipeline independently realize the tee joint, and each air supplying pipeline and the emptying pipeline are sheathed on the internal support structure. The pipeline structure assembly has the advantages that: the problem that branches of multiple pipelines in horizontal and vertical directions are interfered by reasonable internal pipeline arrangement, a pipeline structure is simplified in a limited structure space, unnecessary bend pipe design is avoided, welding and maintaining operation is convenient, and the volume of the whole assembly is reduced. By adopting the internal support structure designed specially, the structure position of the pipeline arrangement can be effectively controlled and the pipeline assembly intensity is also improved.