Flat filter for water treatment, and filter module for water treatment using same

A flat filter for water treatment, comprising:

• a plate-shaped filtration member having a predetermined area;
• a support frame coupled to peripheral portions of the filtration member to support the filtration member, the support frame having channels through which filtered water produced by the filtration member flows;
• and
• a gap adjustment member coupled to the support frame so as to space the filtration member and an adjacent filtration member from each other, the gap adjustment member including
• a body into which a corner of the support frame is inserted, and
• a gap adjusting portion including a fastening hole through which a fastening bar having a predetermined length passes,
• wherein the support frame comprises a plurality of frames coupled to the peripheral portions of the filtration member, and
• wherein each of the plurality of frames includes a first plate, a pair of second plates extending from both ends of the first plate such that the peripheral portions of the filtration member are inserted, and a stopper provided on opposite surfaces of the pair of the second plates to limit an insertion depth by which the filtration member is inserted.