Preparation device and preparation method of tensile film effect anti-cracking composite floor slab

The invention discloses a preparation device of a tensile film effect anti-cracking composite floor slab, which comprises a floor slab mold, base steel bars and truss assemblies, the base steel bars are mounted on the floor slab mold, the truss assemblies are detachably connected with the base steel bars, and the number of the truss assemblies is at least two; the truss assembly comprises an upper chord, a truss web member and a lower chord, the truss web member is installed between the upper chord and the lower chord, the upper chord comprises a curve part protruding outwards and straight parts arranged at the two ends of the curve part, the outer edge of the curve part abuts against the outer side of the bottom face of the composite floor slab, and the straight parts are fixedly connected with the top of the truss web member. The upper chord member and the composite floor slab are poured into a whole, so that when the composite floor slab bears the construction load effect in the transportation and hoisting