Disclosed is a method for preparing a multifunctional technical textile that exhibits multiple functional properties comprising flame or fire-retardancy, EMI shielding, anti-odorous property, UV protection, oil-repellency, anti-soiling property, antimicrobial property, anti-creasing property, water-proof, and antistatic property. The method comprises washing a textile product in a water solution comprising water mixed with a predetermined quantity of non-ionic detergent, storing the textile product at a predetermined temperature and a predetermined relative humidity, and subjecting the textile product to plasma treatment by placing the same in a plasma stream within a reaction chamber.