Environmental protection integrated device: Sodium alkali method is used for dust removal and desulfurization of dust and sulfides, and low-temperature denitrification technology is used for nitrogen oxides. The waste heat cooling system, spray desulfurization and dust removal tower, denitrification, alkaline solution pool, waste gas filtration and smoke removal system, dehumidifier, processor, induced draft fan, and chimney meet the emission standards. When the temperature in the plasma reactor