The invention discloses a preparation method and an applied technology of hydrosulphonyl functionalized loofah, wherein the preparation method is characterized by comprising the following steps: adding thioglycolic acid, tetrahydrofuran, alkalized loofah and concentrated sulfuric acid into a triangular flask with a plug according to mass percentage, plugging, placing the triangular flask at the temperature of 40 DDEG C for 48 hours, then washing with deionized water, filtrating through suction until a filtrate is neutral, washing with a small amount of ethanol, and then putting into a baking oven with the temperature of 35 DEG C for drying to obtain the hydrosulphonyl functionalized loofah. The obtained hydrosulphonyl functionalized loofah has large adsorptive capacity for metallic ions, hydrosulphonyl characteristics, high adsorption efficiency, high adsorption speed, strong selectivity, good desorption performance, good physicochemical stability, excellent mechanical stability and regeneration capacity, can directly adsorb and elute various metallic ions in a water body, and can be used in a wider acid-base range.