Light steel factory building is an environmentally friendly and economical light steel factory building with light steel as the skeleton, sandwich panels as the enclosure material, standard modulus series for spatial integration, and bolt connections for components. It can be easily and quickly assembled and disassembled, achieving universal standardization of temporary buildings, establishing an environmentally friendly, energy-saving, fast and efficient building concept, and enabling temporary houses to enter a standardized product field of series development, integrated production, supporting supply, inventory and multiple turnover.