Enhanced composite hydrophobic membrane and preparation method thereof

The invention provides an enhanced composite hydrophobic membrane and a preparation method thereof. The hydrophobic membrane comprises a fiber support liner, a first layer and a second layer, wherein the first layer and the second layer sequentially coat the fiber support liner; the first layer is a hydrophilic layer or a hydrophobic layer; correspondingly, the second layer is a hydrophobic layer or a hydrophilic layer; the membrane separation hole diameter of the hydrophilic layer is 0.05 to 0.5 mum; the membrane separation hole diameter of the hydrophobic layer is 0.05 to 0.5mum; the thickness of the fiber support liner is 50 to 70 percent of the total wall thickness of the hydrophobic membrane. The hydrophobic membrane has the advantages that the fiber support liner and the hydrophilic/ hydrophobic composite layer are effectively combined, so that the membrane silk intensity is enhanced.