This study pioneers a novel approach by integrating a new auxiliary chemo-immunotherapy regimen, which is then followed by an evaluation of the potential for surgical resection. For those patients who remain non-resectable, a tailored treatment plan is proposed, consisting of arterial infusion chemotherapy in conjunction with radiotherapy, succeeded by a series of immune checkpoint inhibitors. The efficacy and safety of this integrated therapeutic strategy are meticulously assessed, with the goal of enhancing survival outcomes for patients with T4bNanyM0 HNSCC.