Macroporous polymer filtering membrane and its prepn.

The present invention provides a macroporous polymer filtering membrane and its preparation. The membrane has thickness of 70-100 micron, pore size of 10-20 micron and bubbling point pressure of 0.005 MPa. The membrane is prepared through dry and wet process by using hydrophobic polymer as base material and adding hydrophilic polymer and non-solvent. It is used in processing suspension without particle staying in pores to produce pollution and is easy to regenerate through back washing. When used in purifying blood,blood cells may pass freely without damage and some pathogenetic factors may be eliminated selectively by means of modification of the membrane.