An electrochemical device for water treatment and methods of making and using same are provided. The device comprises a winding body and a cavity shell. The winding body comprises a plurality of silver-loaded flexible electrodes and a plurality of insulating interlayers, wherein the silver-loaded flexible electrodes are formed by loading silver on an activated carbon fiber substrate or a flexibleconductive metal substrate, the silver-carrying flexible electrodes and the insulating interlayers are alternately stacked in the order of silver-carrying flexible electrodes, insulating interlayers and silver-carrying flexible electrodes; the alternately stacked silver-carrying flexible electrodes and insulating interlayers are wound from one end to the other end to form the winding body that isprovided with positive and negative electrode wires. The winding body is arranged in the cavity shell, and the cavity shell is provided with a water inlet and a water outlet. Silver is loaded on the flexible electrode material to obtain the silver-loaded flexible electrode, so that the synergistic effect of electrochemical sterilization and silver sterilization performance of the flexible electrode material is achieved, and pollutants in a water body are effectively degraded. The electrochemical device is low in cost, can be repeatedly used, and has good predisposition, innovativeness and practical application prospects.