The invention discloses a method for preparing a fiber braided tube embedded enhanced type polymer hollow fiber microporous membrane, which is characterized by adopting a fiber-braiding and coextrusion integrative membrane forming process, namely a core liquid tube is fixed in the middle of the braded tube, a fibrous bundle is braided into a fiber braided tube along the core liquid tube, then casting film liquid, core liquid and the fiber braided tube are co-extruded by an extrusion die, and the fiber braided tube embedded enhanced type polymer hollow fiber microporous membrane is prepared bya phase transformation method. The method successfully embeds the fiber braided tube into the body of the hollow fiber microporous membrane and introduces the core liquid into the inner cavity of thebraided tube, and effectively controls the inside diameter of the hollow fiber microporous membrane, so that the technical problems that in the prior coating process of preparing a fiber braided tubeenhanced type hollow fiber membrane, a polymer layer is easy to break away from the fiber braided tube, the hollow fiber inner cavity is easy to be blocked, and the like are solved, thus the polymer hollow fiber microporous membrane with high backwashing pressure, high mechanical strength, high flux, high retention performance and hydrophilic property is obtained.