The present invention discloses a slag backflow blocking device and a control method of the wind-gu. The slag backflow blocking device of a windpipe of the present invention comprises: a flow rate sensing unit configured to detect a blowing flow rate blown to the windpipe through a blowing branch pipe; A temperature sensing unit for sensing the surface temperature of the PC blowing lance; A lance sprinkling valve for supplying cooling water to a wind tunnel through a PC blowing lance; A branch pipe sprinkling valve supplying cooling water to the blowing branch pipe; And a control unit that senses a change in the blowing flow rate input from the flow rate sensing unit, operates the lance sprinkling valve, and then operates the branch pipe sprinkling valve based on the surface temperature change input from the temperature sensing unit.
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