High-desalination polyamide reverse osmosis membrane as well as preparation method and application thereof

The invention discloses a high-desalination polyamide reverse osmosis membrane as well as a preparation method and application thereof. The method comprises the following steps: step 1, preparing a supporting base membrane; 2, forming a polyamide separation layer on the supporting base membrane through an interfacial polymerization reaction of water-phase polyamine and organic-phase polyacyl chloride; 3, carrying out surface treatment on the polyamide separation layer by using a polar mixed solvent containing a condensing agent and polyaminopropyl biguanide; and optionally, 4, immersing the membrane subjected to surface treatment into a glycerol solution for soaking treatment, taking out and drying to obtain the high-desalination polyamide reverse osmosis membrane. According to the method, polyaminopropyl biguanide is matched with a condensing agent to modify a polyamide desalination layer of the reverse osmosis membrane, the cross-linking density is improved, and a polar solvent swelling scheme is matched, s