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This invention provides an integrated method for controlling the converter furnace mouth and its application. The method includes the following steps: S1. Structural optimization: synchronously performing adaptive adjustments to the water-cooled furnace mouth diameter expansion and furnace hood length to form a smooth charging channel; S2. Charge preparation: preparing magnesia-based supplementary charge with specific particle size and composition; S3. Charge supplementation: when the tapping angle reaches -80° to -85°, directionally supplementing the charge to the critical area of ​​slag impact; S4. Feedback control: dynamically adjusting the supplementation amount based on real-time monitoring of the furnace lining condition; S5. System fine-tuning: performing closed-loop fine-tuning of structural parameters and supplementation strategies based on slag runoff and charging cycle data. This method integrates and solves the technical problems of long main raw material charging cycles and severe slag runoff at the furnace mouth during tapping, effectively improving converter production efficiency, reducing molten steel loss, and improving the production environment.