A water treatment apparatus comprising: a plurality of panels (11, 12, 13) combined with each other to form an outer appearance of the water treatment apparatus; and a filter module to remove a foreign matter from raw water that is introduced, wherein the filter module comprises: an activated carbon fiber filter including one activated carbon fiber filter unit or including a plurality of activated carbon fiber filter units which are stacked; a second activated carbon fiber filter configured to receive the water output through the activated carbon fiber filter; a pre-carbon block filter configured to purify water introduced from an outside and to then supply the water to the activated carbon fiber filter; a UF membrane filter configured to receive the water output through the second activated carbon fiber filter, to purify, and to then discharge the water; and a post-carbon block filter configured to receive the water output through the UF membrane filter, to purify, and to then discharge the water; wherein each of the activated carbon fiber filters (100, 500) includes: a plurality of activated carbon fiber layers including activated carbon fiber and stacked in parallel to each other; a plurality of spacers interposed between the activated carbon fiber layers to prevent short; a pair of current collectors disposed on opposite sides of the stack of activated carbon fiber layers, respectively, and wherein one of the current collectors is connected to one end portion of an activated carbon fiber layer of the stack of activated carbon fiber layers and another of the current collectors is connected to an opposite end portion of an adjacent activated carbon fiber layer of the stack of activated carbon fiber layers such that adjacent activated carbon fiber layers alternately form positive and negative electrodes, respectively; and a power supply unit (140, 150) to apply, through the current collector, a current to the activated carbon fiber layer forming the positive electrode and the negative electrode. a plurality of panels (11, 12, 13) combined with each other to form an outer appearance of the water treatment apparatus; and a filter module to remove a foreign matter from raw water that is introduced, wherein the filter module comprises: an activated carbon fiber filter including one activated carbon fiber filter unit or including a plurality of activated carbon fiber filter units which are stacked; a second activated carbon fiber filter configured to receive the water output through the activated carbon fiber filter; a pre-carbon block filter configured to purify water introduced from an outside and to then supply the water to the activated carbon fiber filter; a UF membrane filter configured to receive the water output through the second activated carbon fiber filter, to purify, and to then discharge the water; and a post-carbon block filter configured to receive the water output through the UF membrane filter, to purify, and to then discharge the water; an activated carbon fiber filter including one activated carbon fiber filter unit or including a plurality of activated carbon fiber filter units which are stacked; a second activated carbon fiber filter configured to receive the water output through the activated carbon fiber filter; a pre-carbon block filter configured to purify water introduced from an outside and to then supply the water to the activated carbon fiber filter; a UF membrane filter configured to receive the water output through the second activated carbon fiber filter, to purify, and to then discharge the water; and a post-carbon block filter configured to receive the water output through the UF membrane filter, to purify, and to then discharge the water; wherein each of the activated carbon fiber filters (100, 500) includes: a plurality of activated carbon fiber layers including activated carbon fiber and stacked in parallel to each other; a plurality of spacers interposed between the activated carbon fiber layers to prevent short; a pair of current collectors disposed on opposite sides of the stack of activated carbon fiber layers, respectively, and wherein one of the current collectors is connected to one end portion of an activated carbon fiber layer of the stack of activated carbon fiber layers and another of the current collectors is connected to an opposite end portion of an adjacent activated carbon fiber layer of the stack of activated carbon fiber layers such that adjacent activated carbon fiber layers alternately form positive and negative electrodes, respectively; and a power supply unit (140, 150) to apply, through the current collector, a current to the activated carbon fiber layer forming the positive electrode and the negative electrode. a plurality of activated carbon fiber layers including activated carbon fiber and stacked in parallel to each other; a plurality of spacers interposed between the activated carbon fiber layers to prevent short; a pair of current collectors disposed on opposite sides of the stack of activated carbon fiber layers, respectively, and wherein one of the current collectors is connected to one end portion of an activated carbon fiber layer of the stack of activated carbon fiber layers and another of the current collectors is connected to an opposite end portion of an adjacent activated carbon fiber layer of the stack of activated carbon fiber layers such that adjacent activated carbon fiber layers alternately form positive and negative electrodes, respectively; and a power supply unit (140, 150) to apply, through the current collector, a current to the activated carbon fiber layer forming the positive electrode and the negative electrode.