The invention relates to a composite type building plate which solves the problem that the prior building plate has low strength, more material consumption, poor heat preservation and sound insulation effect and inconvenient assembly. The composite type building plate consists of a plurality of open web formworks (1) arranged in parallel, wherein lower plates (3) and upper plates (2) of the open web formworks (1) are provided with embeddable grooves (4) and embossed strips (5) respectively; or the upper plates (2) of the open web formworks (1) are flat plates, and the lower plates (3) are provided with the grooves (4); or the lower plates (3) of the open web formworks (1) are flat plates, and the upper plates (2) are provided with the embossed strips (5); left plates (6) and right plates (7) of the open web formworks (1) are bonded with the upper plates and the lower plates respectively to form an open web (8); and the embossed strips (5) on the upper plates of a first open web formwork are embedded with the grooves (4) on the lower plates of a second open web formwork.