The invention relates to an anti-pollution composite multi-layer polymer separation membrane and a preparation method thereof. The separation membrane has excellent separation function, biocompatibility and anti-pollution capacity. The composite multi-layer polymer separation membrane is of a multi-layer structure including a support layer and a hydrophilic interception functional layer, wherein the multi-layer structure is formed on the support layer, and the interface between the hydrophilic interception functional layer and the support layer is of a continuous structure; the hydrophilic interception functional layer is formed by polysulfone segmented copolymers containing hydrophilic blocks, and polysulfone macromolecules are one of polysulfone, polyether sulfone, sulfonated polysulfone and polyethylene sulfone. Besides, the content of oxygen element on the surface of the hydrophilic interception functional layer of the composite membrane is more than 17%, and the composite membrane has permanent hydrophily which is not changed along with the use time of the separation membrane. The composite multi-layer polymer separation membrane can be used as a super-micro filtration membrane as well as base membranes of nanofiltration membranes, reverse osmosis membranes and forward osmosis membranes and can be widely applied to the separation and concentration processes in the fields of biology, medical treatment, electrons, foods and the like.
; 王宁
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