Concrete cast-in-place plastic formwork for ribbed floor system

The utility model discloses a concrete cast-in-place plastic mould shell of a multi-ribbed floor system, which solves the technical problem of slurry leakage at the bottom of a box mould of a multi-ribbed floor system structure. The plastic mold comprises a plastic mold shell, the bottom of the plastic mold shell extends outwards in the circumferential direction to form a circle of wing plate, and the top face and the outer side face of the wing plate are smooth and continuous arc faces. The box mold is simple in structure, scientific and reasonable in design and convenient to use, the top faces and the outer side faces of the wing plates are designed to be smooth and continuous arc faces, when a concrete dense rib beam is cast in place, seam filling of a sole timber formwork and seam wrapping of floor leather are not needed between every two adjacent plastic mold shells, and slurry leakage at the bottom of the box mold of the dense rib floor system structure can be effectively avoided. Meanwhile, the procedu