Hydrophilic hollow fiber membrane and preparation method thereof

The invention relates to a hydrophilic hollow fiber membrane and a preparation method thereof. The method includes the following steps that polypropylene resin, diluent and a modified additive insoluble in water are added into a spinning kettle with a stirring device, the material is stirred for a period of time under the vacuum condition after being heated, and a membrane casting solution is obtained; the membrane casting solution is conveyed to a spinning nozzle through a gear metering pump, meanwhile an inner solidification medium at a certain temperature is introduced into the spinning nozzle, and a hollow fiber membrane is formed; the hollow fiber membrane is cooled and solidified through an outer solidification medium and then rolled, and then the hollow fiber membrane is put in an extraction agent for extraction or multiple extraction agents for sequential extraction; the extracted membrane is taken out, the membrane is dried, and after the extraction agent/agents is/are removed, the hydrophilic hollow