The invention relates to a hollow-fiber membrane module of an additional electric field, comprising a module casing (13), an anode (4), a cathode (14) and a U-shaped hollow-fiber membrane silk (12), wherein the module casing (13) is provided with a water inlet (3), an air release valve (5) and a cross flow water outlet (11) at the upper casing and the lower casing, the anode (4) is arranged at the central axis of the module casing (13), the cathode (14) is arranged outside the anode (4), the U-shaped hollow-fiber membrane silk (12) is arranged between the anode (4) and the cathode (14). In the process of membrane filtration, under the action of the electric field, charged organics or particles go through electrophoretic migration, electrocoagulation, which can reduce concentration polarization and membrane pollution caused by the charged organics or particles. The module of the invention integrates the electric field with the hollow-fiber membrane, thus giving play to the advantages of the hollow-fiber membrane, such as high filtration and separation efficiency, large membrane filtration area and small occupied space; in addition, multiple modules can be connected in parallel to obtain higher filtration speed and enhance membrane separation efficiency, as a result, the hollow-fiber membrane module enjoys extensive application prospect in the field of deep processing concerning water treatment.