The utility model relates to a prevent water curtain structure, include: splice a plurality of metal sheets of connecting each other, the metal sheet is including locating the inboard of wall keel and the outside relative with the inboard, and mutual a plurality of curtain boards of connecting of concatenation, the subsides of a plurality of curtain board locate a plurality of metal sheets the outside, and the concatenation seam of a plurality of metal sheets and the concatenation seam of a plurality of curtain boards stagger each other. The utility model discloses prevent water curtain structure adopts the mode of addding the metal sheet in curtain board department, has increased water prevention measure one to strengthened the waterproof function of curtain board, the waterproof performance that has solved curtain among the prior art is good problem inadequately.