The full-thoracic multi-frequency oscillation expectoration device sends pulse signals from the main unit, causing the inflated airbag to repeatedly inflate and generate high-frequency oscillations. This creates a directional and autonomous drainage effect, facilitating the relaxation, liquefaction, and detachment of deep secretions in the respiratory tract and lung lobes. As a result, the mucus moves from the bronchi to the main airway and can then be expelled from the body through coughing or manual suction.