The invention discloses a moulding board for building purposes, comprising a troughlike mould (1), bolt (2) or a latch, a connecting strip (6) and a connecting strip positioning member (7), wherein distances among holes (4) on a flange of the troughlike mould (1) are equal and represented by L, and the distance from the end of the flange (3) to the first hole (4) is half L. During the assembling of the moulding boards, a plurality of troughlike moulds (1) are sequentially arranged in order so that the holes (4) on the flanges (3) of every two adjacent troughlike moulds (1) can correspond to each other, and the bolts (2) or the latches are caused to penetrate through the holes (4) so that every two adjacent troughlike moulds (1) can be connected with each other, thereby forming the needed moulding board. The moulding board for building purposes has the advantages of high rigidity and bearing capacity, long service life and simple construction process, thus being convenient for standardized production and applicable to the building construction of concrete beams, floorslabs, shear walls and upright posts.