The invention discloses a giant leaf surface structure for an atrium of a factory building. The giant leaf surface structure is characterized by comprising a Y-shaped support and leaf surfaces, wherein the leaf surfaces are arranged on the Y-shaped support, and comprise shape steel leaf surface beams and concrete plates; the shape steel leaf surface beams are poured in the concrete plates. The giant leaf surface structure is simple, reasonable in design, unique in shape and high in mechanical property, forms a building roof of the factory building, and has the advantages of fashion, attractive appearance and practicability.