High-pressure separation membrane element suitable for high-salinity concentration and preparation method of high-pressure separation membrane element

The invention belongs to the technical field of water treatment, and particularly discloses a high-pressure separation membrane element suitable for high-salinity concentration and a preparation method of the high-pressure separation membrane element. The membrane element comprises a water treatment membrane set composed of five layers of different water treatment membranes, the stacking sequence of the water treatment membranes is further limited, the water treatment membranes are prepared by adjusting the composition of a water phase and an oil phase and improving a post-treatment process, and the flux and desalting performance of the membranes are improved. The manufactured high-pressure separation membrane element can be used in a high-pressure or high-concentration saline water operating environment, and the water flux and the desalination rate are improved. The high-pressure separation membrane element disclosed by the invention can be applied to seawater desalination and treatment of near-zero-emission