This sterile water filter is made of a double-layer 0.2 micron folded membrane, and the pre filtration layer adopts an asymmetric structure membrane, which can intercept more than 10 ^ 7/cm2 of defective pseudomonas. It can quickly and conveniently provide sterile water for patients, medical staff, equipment, etc., reducing the risk of infection. This product has a compact structure, easy installation, a long service life, and good performance.