The invention discloses a fabricated large module semi-welded composite beam plate structure with three-dimensional truss temporary supports, and belongs to the technical field of structural engineering. The quadrangular three-dimensional truss temporary supports are connected with beams through connecting plates and bolts to form a temporary whole body. Reinforcing mesh is paved on the temporarysupports, and the precast concrete layer is poured after the reinforcing mesh is paved. After the fabricated large module composite beam slab structure with the plane truss temporary supports are fabricated and machined in a factory, the fabricated large module composite beam slab structure is transported to the site for hoisting in place. The upper portion of the precast concrete layer is paved with reinforcing mesh pieces on the upper layer of the floor, and concrete is poured on the remaining floors to form the composite floor slab. After the floor maintenance is finished, the bolts are removed and the temporary supports are removed to complete the construction of the fabricated composite floor slab. According to the fabricated large module semi-welded composite beam slab structure withthe temporary supports, the problem of integrity of the floor slab is solved, the weight of the hoisting is reduced, and the fabricated accuracy and construction efficiency are improved.