A tracheotomy tube assembly has an insertion set (10), a flexible connector (20) connected to an insertion tube (11) of the insertion set (10), and a connecting tube (30). A proximal end of the connecting tube (30) is connected to an annular connecting portion (22) of the flexible connector (20) that is disposed on a second end of the flexible connector (20). Overlapping portions of the connecting tube (30) and the flexible connector (20) are greatly reduced to prevent the patient (40) from being infected. Movements of the connecting tube (30) do not interfere with the insertion set (10), so discomfort of the patient (40) can be eased. Structure of the flexible connector (20) is simplified, so the tracheotomy tube assembly has less manufacturing processes and low manufacturing cost.
