The invention relates to the technical field of building materials, and discloses a distributed three-dimensional factory floor slab and a manufacturing method. The distributed three-dimensional factory floor slab comprises non-dismantling concrete bundle heat preservation double-T formworks, steel bars, steel bar meshes, steel plate cold-extruded trusses, truss clamping parts, cushion blocks, inorganic heat preservation, sound insulation and fireproof floor slab cavities, water-electricity-heating network pipes and threading boxes, wherein high-performance concrete is poured outside the inorganic heat preservation, sound insulation and fireproof floor slab cavities. The distributed three-dimensional factory floor slab disclosed by the invention does not need the links of PC fabrication, transportation and hoisting, saves the PC factory investment, transportation and hoisting cost, and does not need to solve the structural problem of mounting abutted seams. According to the floor slab,floor-after-floor operation is carried out, so that the floor area is saved. The floor slab is provided with the steel bar meshes and the steel plate cold-extruded trusses, so that large-span mounting can be realized. A bottom formwork of the floor slab is of a hollow structure, so that the floor slab has sound insulation, sound absorption and heat preservation functions, and is light in mass andconvenient for transportation and hoisting. The inorganic heat preservation, sound insulation and fireproof floor slab cavities are paved in the middle of the floor slab, so that the dead weight of the floor slab is reduced by 30 to 60 percent.