Polyethylene hollow fiber composite membrane as well as preparation method and application thereof

The invention relates to the technical field of membrane separation materials, and discloses a polyethylene hollow fiber composite membrane as well as a preparation method and application thereof. The polyethylene hollow fiber composite membrane comprises a reinforcement body and a separation layer which is combined on the outer surface of the reinforcement body and contains polyethylene and a hydrophilic additive, the separation layer is partially embedded into the reinforcement body to form a composite interface, and the hydrophilic additive comprises a hydrophilic organic polymer and a hydrophilic inorganic substance; the water contact angle of the polyethylene hollow fiber composite membrane is not more than 90 degrees; the average pore size of the composite membrane is 0.1-0.8 [mu] m, and the ratio of the average pore size to the peak pore size of the composite membrane is 0.8-1.4; and the depth of the separation layer embedded into the reinforcement body accounts for 7-50% of the wall thickness of the r